| Effect of the Ionosphere on Space and Terrestrial Systems |
1978 |
637 pages |
| Authors:
John M. Goodman; NAVAL RESEARCH LAB WASHINGTON DC
|
 | Partial Contents; Radiowave Scintillation: Experiments and Mitigation Schemes; Radiowave Scintillation: In Situ Measurements, Modelling, and Channel Simulation; Radio Noise and Radiowave Propagation Between ELF and HF; Spacecraft Charging and Space/Microwave Interactions; Forecasting Studies and Ionospheric Modification; and Ionospheric Effects: Ranging and Navigation Systems; |
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| VLF Transmission Induced Slot Electron Precipitation. |
05 DEC 1977 |
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| Authors:
Alfred L. Vampola; AEROSPACE CORP EL SEGUNDO CALIF IVAN A GETTING LABS
|
 | Analysis of electron observations in the drift and bounce loss cones of the slot region of the magnetosphere indicates that the predominant mode in which electrons in the 100 to 400 keV energy range arrive in the drift loss cone is via discrete events. These events are usually traceable back to the vicinity of a high-power-level VLF transmitter. No gradual buildup of electron flux, proceeding eastward from the South Atlantic ... |
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| Stimulation of ULF (Ultra-Low-Frequencies) Geomagnetic Pulsations by Controlled VLF (Very-Low-Frequencies) Transmissions into the Magnetosphere |
DEC 1977 |
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| Authors:
A. C. Fraser-Smith; R. A. Helliwell; T. F. Bell; T. L. Crystal; B. Dingle; STANFORD UNIV CA STANFORD ELECTRONICS LABS
|
| This report presents the results of an investigation of a proposed method for the controlled artificial generation of ultra-low-frequency (ULF) hydromagnetic waves of class Pc 1 (0.2 to 5 Hz) in the ionosphere and magnetosphere. In this method, which is called the VLF method, a large ground- based very-low-frequency (VLF) transmitter is used to stimulate the ULF waves by injecting pulses of VLF waves into the magnetosphere. A second possible ... |
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| Study of Plasma Flow Near the Earth's Plasmapause. |
28 NOV 1977 |
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| Authors:
M. Harel; R. A. Wolf; P. H. Reiff; H. K. Hills; RICE UNIV HOUSTON TEX
|
| The first simulation run of a magnetospheric substorm was successfully completed. The computer program was developed to simulate aspects of the behavior of the closed-field-line portion of the earth's magnetosphere, and the auroral and subauroral ionosphere, during a magnetospheric event. The program self-consistently, computes electric fields, electric currents and plasma flow velocities in these regions. The basic program has been run for several idealized cases, and various output and plotting ... |
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| Dyadic Green's Function for a Two-Layered Earth. |
NOV 1977 |
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| Authors:
Hussain A. Haddad; David C. Chang; AIR FORCE WEAPONS LAB KIRTLAND AFB N MEX
|
| Both the near-zone and far-zone electromagnetic field of an arbitrarily oriented dipole above a two-layer earth surface is obtained to a high degree of accuracy using a combination of numerical and analytical computational schemes. It is shown that marked differences exist between the field structures of a vertical dipole and a horizontal dipole in the case when the observation is made on the earth surface in the plane of the ... |
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| Low Latitude PC 3 and PC 4 Micropulsations. |
28 OCT 1977 |
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| Authors:
Victor L. Badillo; MANILA OBSERVATORY (PHILIPPINES)
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| Equatorial Pc 3 and Pc 4 were obtained from normal run magnetogram from January to June 1976 using the eye alone. Micropulsations may possibly be used to derive information on incoming solar particles. (Author) |
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| Study of Selected Events in the Baikal Rift Zone in a Seismic Discrimination Context. |
17 OCT 1977 |
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| Authors:
P. A. Sobel ; D. H. von Seggern; E. I. Sweetser; D. W. Rivers; TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA ANALYSIS CENTER
|
| Six events from the Baikal rift zone occurring from 1971 to 1975 were examined in a seismic discrimination context. Seismograms from ALPA, LASA, NORSAR, the HGLP, the WWSSN, and the SRO stations were studied for source mechanism, Ms-mb, corner frequency, pP, complexity, and spectral ratio. All the Baikal events can be identified as earthquakes except the November 5, 1976, event which shows explosion characteristics. The characteristics of the Baikal events ... |
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| Ocean Magnetics: 1. Fundamental Survey and Estimates of Induction Phenomena |
OCT 1977 |
96 pages |
| Authors:
J. F. Bird; H. W. Ko; JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
|
| Hydromagnetic phenomena are induced the ocean environment by motions of the electrically conducting seawater across ambient fileds. The present report is intended to survey and estimate possible effects from a fundamental theoretic standpoint. The ocean motions considered include both those of natural origin and those associated with moving ocean vehicles. The ambient magnetic field is that due to the earth, plus that due to the vehicle if it is magnetizable. ... |
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| Overview of Solar-Terrestrial Physics Phenomena for the Retrospective World Interval of 20 March - 5 May 1976. |
28 SEP 1977 |
|
| Authors:
M. A. Shea; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MASS
|
| A summary of the significant solar-terrestrial events that occurred during the Retrospective World Interval of 20 March - 5 May 1976 has been prepared using data available at the present time. Although this period occurred at solar minimum, it was an active interval - one in which the principal events were associated with solar activity in a region at Carrington Longitude approximately 45. (This active center was designated McMath Plage ... |
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| The Effects of Recent Secular Variations of the Geomagnetic Field on Vertical Cutoff Rigidity Calculations, |
02 SEP 1977 |
|
| Authors:
M. A. Shea; D. F. Smart; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MASS
|
| Recent geomagnetic measurements have shown that changes in the geomagnetic field have deviated from the predictions of the original International Geomagnetic Reference Field (IGRF) coefficients and associated time derivatives. Accordingly, a new set of time derivatives has been determined with the suggestion that these be applied for time periods after 1975. To ascertain the effects of the changes of geomagnetic field time derivatives on cosmic ray analyses, vertical cutoff rigidities ... |
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| Inter-Relationships of Solar and Interplanetary Plasma, Magnetic Fields and Energetic Particles Relevant to the Prediction of Solar-Terrestrial Disturbances, |
29 JUL 1977 |
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| Authors:
E. C. Roelof; R. E. Gold; JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
|
| A summary is presented of research from the past year's efforts supported under this contract. The research covered inter-related topics in solar-terrestrial relationships. It is recommended that the present dual approach of investigations of solar-terrestrial events both of the past solar cycle as well as contemporary observations be continued. Comparison of phenomena among different phases of the solar cycle have identified several inter-relationships useful in the development of prediction techniques ... |
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| Closed Form Magnetic Quarter Orbit Switch Point Solution. |
15 JUL 1977 |
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| Authors:
L. K. Herman; AEROSPACE CORP EL SEGUNDO CALIF ENGINEERING SCIENCE OPERATIONS
|
| A closed form solution is derived for determining the location of a set of magnetic switch points, spaced 90 deg apart in the orbit, which will allow the spin axis of a satellite to be moved in any, achievable, desired direction from any initial orientation. Additional closed form equations are derived for determining the magnitude of the motion that will result for a given set of switch points. The simplicity ... |
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| Experimental Investigation of the Characteristics of Pc1 Micropulsation Propagation Using a Midlatitude Five-Station Receiving Network. |
18 MAY 1977 |
|
| Authors:
Edwin L. Althouse; John R. Davis; NAVAL RESEARCH LAB WASHINGTON D C
|
| An experimental study has been made of the characteristics of the propagation of midlatitude Pc1 micropulsations for the purpose of assessing the applicability of the 0.5-2.0 Hz frequency band to naval communications. Naturally occurring hydromagnetic emissions were the object of study because no effective way of artificially generating these waves is known. Observations were made using a five-station receiving network stretching from New York to Florida and from Maryland to ... |
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| Geomagnetic Activity: Dependence on Solar Wind Parameters. |
MAY 1977 |
|
| Authors:
Leif Svalgaard; STANFORD UNIV CALIF INST FOR PLASMA RESEARCH
|
| Current ideas about the interaction between the solar wind and the earth's magnetosphere are reviewed. The solar wind dynamic pressure as well as the influx of interplanetary magnetic field lines are both important for the generation of geomagnetic activity. The influence of the geometry of the situation as well as the variability of the interplanetary magnetic field are both found to be important factors. Semi-annual and Universal Time variations are ... |
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| Stimulation of Pc 1 Micropulsations by Controlled VLF Transmissions. |
07 APR 1977 |
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| Authors:
Harry C. Koons; AEROSPACE CORP EL SEGUNDO CALIF SPACE SCIENCES LAB
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| Experiments designed to artificially generate ultra-low-frequency (ULF) waves were undertaken in conjunction with controlled very-low-frequency (VLF), wave transmissions conducted at Fort Richardson, Alaska (L approximately 4). Pc 1 micropulsations are believed to be produced by a Doppler-shifted, resonant interaction between Alfven waves and moderately-energetic, ring-current protons (Jacobs, 1970). This interaction is analogous to the interaction between VLF whistler-mode waves and energetic electrons. The interaction occurs between waves and particles traveling ... |
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| Electromagnetic Background Noise in the Ocean Due to Geomagnetic Activity in the Period Range 0.5 to 1000 Seconds |
MAR 1977 |
38 pages |
| Authors:
M. B. Kraichman; NAVAL SURFACE WEAPONS CENTER WHITE OAK LAB SILVER SPRING MD
|
| A summary is given of some of the characteristics of geomagnetic micropulsations. Based on a knowledge of micropulsation data measured at surface land stations, expressions are presented for obtaining estimates of the horizontal and vertical components of the electric and magnetic fields in the open ocean in the period range of interest, 0.5 to 1000 sec. Numerical results are presented for a seawater layer over an earth bottom. Perturbations in ... |
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| Suppression Effects Associated with VLF Transmitter Signals Injected into the Magnetosphere. |
MAR 1977 |
|
| Authors:
Rajagopalan Raghuram; STANFORD UNIV CALIF STANFORD ELECTRONICS LABS
|
| Magnetospheric growth of coherent VLF signals transmitted from Siple Station, Antarctica is inhibited by whistler mode echoes of earlier transmitter signals. This new phenomenon, called echo-induced suppression, is observed at least a third of the time that transmissions from Siple Station are detected at the receiving station in Roberval, Quebec, Canada. Suppression levels as high as 20 dB are observed. Though the echo is usually much weaker than the direct ... |
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| The Magnetic Field and Magnetic Field Gradients of the NUC Oceanographic Research Tower. |
MAR 1977 |
|
| Authors:
George H. Gillespie; Walter N. Podney; PHYSICAL DYNAMICS INC MCLEAN VA
|
| Measurements were made of the ambient magnetic field and magnetic field gradients near the Naval Undersea Center (NUC) Oceanographic Research Tower. This report summarizes the experiment and its results. The NUC Tower is located approximately 0.7 miles off the California Coast, near San Diego, and is the proposed site for the shallow water trials of the ARPA Internal Wave Magnetic Sensing (IWMS) experiment. The measurements described here were made in ... |
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| Towed H-Magnetometer (Buksiruyemyy H-Magnitometr), |
01 FEB 1977 |
|
| Authors:
I. G. Zhuriy ; A. Ya. Rotshteyn; NAVAL INTELLIGENCE SUPPORT CENTER WASHINGTON D C TRANSLATION DIV
|
| Measurements of the TMF on a water surface are made with magnetometers placed in a towed bird behind the ship. Towed component magnetometers are currently in the design and testing stage. In the present paper, the authors propose a magnetometer for direct measurement of the horizontal component of the TMF with indirect stabilization of the MFE of the quantum magnetometer (with a rigid mounting of the MFE in the towed ... |
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| The Trapped Radiation Handbook. Change 5, |
21 JAN 1977 |
102 pages |
| Authors:
John B. Cladis; Gerald T. Davidson; Lester L. Newkirk; LOCKHEED MISSILES AND SPACE CO INC PALOALTO CA PALO ALTO RESEARCH LAB
|
| The geomagnetic field, like other large-scale phenomena found in nature, is never absolutely quiescent or undistrubed. Field measurements versus time show a variety of disturbances having time durations lasting from a fraction of a second to as long as several days. The patterns are irregular in some cases and smooth in others, and might have a partially periodic or oscillatory structure. Some of the disturbances undoubtedly play a strong role ... |
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| Relation Between Bounce-Averaged Collisional Transport Coefficients for Geomagnetically Trapped Electrons. |
08 DEC 1976 |
|
| Authors:
Michael Schulz; AEROSPACE CORP EL SEGUNDO CALIF IVAN A GETTING LABS
|
| The unweighted bounce average (N(j)) of the atmospheric (Nj) along a field line and the weighted bounce average ((B(0)/B)N(j) cos squared alpha) are related (for each atmospheric constituent (j)) by an integral or derivative with respect to the sine (y) of the equatorial pitch angle (alpha(0)), where B/B(0)(= 1/y squared sin squared alpha) is the ratio of local to equatorial magnetic-field intensity and alpha is the local pitch angle. The ... |
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| Computer Simulation of Anomalies Created by an Array of Ferrous Objects in the Earth's Magnetic Field, |
NOV 1976 |
|
| Authors:
R. W. Hemrich; DEFENCE RESEARCH ESTABLISHMENT SUFFIELD RALSTON (ALBERTA)
|
| This report describes a FORTRAN IV computer simulation of a three-dimensional array of ferrous objects and its effect on the earth's magnetic field. The program output is a plot of the magnetic anomaly amplitude versus distance along a path similar to that recorded by a total field magnetometer passing over the array. The array size, object mass, direction of the earth's field and the altitude and direction of the path ... |
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| Instruments and Method for Investigating Electric Fields in the Sea Using Small Bases (Apparatura i Metodika Issledovaniya Elektricheskogo Polya v More s Ispol'zovaniyem Malykh Baz), |
27 OCT 1976 |
|
| Authors:
V. I. Lopatnikov; Yu. P. Butrov; V. B. Fedoseyev; NAVAL INTELLIGENCE SUPPORT CENTER WASHINGTON D C TRANSLATION DIV
|
| The article discusses a method of measuring electric field strength using small bases in overseas expeditions. The comparative characteristics of this method are discussed in relation to the method of paravane measurements. Tellurograms obtained by using this new method are presented. (Author) |
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| Electromagnetic Variation Anomalies in the Arctic Ocean (Anomalii Elektromagnitnykh Variatsiy v Severnom Ledovitom Okeane), |
22 SEP 1976 |
|
| Authors:
V. S. Shneyer; NAVAL INTELLIGENCE SUPPORT CENTER WASHINGTON D C TRANSLATION DIV
|
| It is known that, unlike the permanent terrestrial magnetic field, the variable field is distributed rather uniformly in space. This is brought about by the external distant location of the variable field sources and their relatively uniform distribution above the Earth. More or less significant gradients of the variation field should be observed only near the polar and equatorial electro-jets. This is what was thought until quite recently when the ... |
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| SCATHA Satellite Instrumentation Report: Thermal Plasma Analyzer; Rapid Scan Particle Detector; Electron Beam System; Positive Ion Beam System. |
10 SEP 1976 |
|
| Authors:
Arthur L. Pavel; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MASS
|
| The Air Force Geophysics Laboratory will furnish four experiments for the synchronous research satellite SCATHA (Spacecraft Charging at High Altitudes) scheduled for launch in 1978. These instruments include: (1) Boom and surface mounted gridded probes to measure the thermal (0 to 100 eV) plasma environment and the structure of the satellite photo-sheath; (2) A combination of electrostatic analyzers and solid state spectrometers to measure the plasma particle fluxes (50 eV ... |
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| Behavior of Auroral Zone Total Electron Content During Substorms, |
03 SEP 1976 |
|
| Authors:
Ib Steen Mikkelsen; K. Damgaard; DANISH METEOROLOGICAL INST COPENHAGEN GEOPHYSICAL DEPT
|
| The auroral zone total electron content TEC as computed from the ATS-3 Faraday-rotation shows systematic changes during magnetic activity. These changes depend upon local time, season, sunspot-cycle and the prehistory of the magnetic activity. During summer and equinox the daytime TEC both shows a positive and negative phase, which probably are related to the prehistory of the magnetic activity. During winter the daytime TEC is dominated by enhancements as responses ... |
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| The Ionospheric F-Region Near 60 Deg Magnetic Latitude: Monthly Mean Behavior and Substorm Effects During Winter Nights. |
SEP 1976 |
|
| Authors:
Michael Mendillo; Michael Buonsanto; BOSTON UNIV MASS DEPT OF ASTRONOMY
|
| The aim of the study is to provide the first detailed look at the morphology of the ionospheric F-region near a geomagnetic latitude of 60 degrees. This region is of considerable interest because it lies at the base of the geomagnetic field line which forms the average boundary of the plasmasphere, the geomagnetic field-aligned envelope of co-rotating plasma which extends to approximately four earth radii in the equatorial plane (L ... |
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| Investigation of Magnetic Field Phenomena in the Ionosphere. |
SEP 1976 |
|
| Authors:
John F. Devane; Robert Dalrymple; Edward Johnson; WESTON OBSERVATORY MASS
|
| Weston Observatory (Boston College) has maintained a geomagnetic observatory to continuously monitor changes in the geomagnetic field and to provide standards for magnetic instrumentation as well as a coil system in which a wide variety of magnetic instrumentation has been tested and calibrated to support AFGL testing and installation of portions of a magnetometer network for the collection and digital transmission of magnetic activity data to Bedford, Mass. The observatories ... |
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| Geopole Observatory Data Summary 1 July 1974-31 March 1976. |
31 AUG 1976 |
|
| Authors:
Dale F. Korff; REGIS COLL RESEARCH CENTER WESTON MASS
|
| A summary of VLF, magnetometer, riometer, and 5577A photometer ten-minute averaged data from the Geopole Observatory, Thule Air Base, Greenland, for the period 01 July 1974 - 31 March 1976, is presented along with a thirty-second data survey for the same sensors of energetic particle and magnetic disturbance events for the winter seasons 1973-74, 1974-75, and 1975-76. The occurrence of these events in relation to the interplanetary magnetic field sector ... |
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| Relation Between Monopole Mass and Primary Monopole Flux. |
12 AUG 1976 |
|
| Authors:
John M. Cornwall; Henry H. Hilton; AEROSPACE CORP EL SEGUNDO CALIF SPACE SCIENCES LAB
|
| We give quantitative results concerning the simple idea that the probability of observing a monopole at the earth with Beta equal to or approximately 0.5 decreases as the monopole mass decreases, for masses < or = 10,000 GeV: the effective cross-section of the earth is roughly the geometric cross-section times the ratio of the monopole mass to 8000 GeV. (Author) |
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| Solar Activity, Geomagnetic Field and Terrestrial Weather. |
JUL 1976 |
|
| Authors:
J. W. Knight; P. A. Sturrock; STANFORD UNIV CALIF INST FOR PLASMA RESEARCH
|
| There is strong evidence for a casual connection between the interplanetary magnetic field and geomagnetic activity, and some evidence for a connection (possibly indirect) between the interplanetary magnetic field structure and atmospheric vorticity. The interplanetary magnetic field originates in the sun and exhibits long-lived sector structure with a fairly well defined synodic rotation period of approximately 27.1 days. It would therefore appear that an independent test of these associations could ... |
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| A Magnetometer Data Acquisition System. |
JUN 1976 |
|
| Authors:
Constantine Louis Xefteris; NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
|
| A system for the analysis of geomagnetic and gradient noise is described. The nominal 176 kHz Larmor frequency output of an optically pumped cesium magnetometer is mixed to a frequency in the 1.2 kHz range and FM tape recorded. The recorded output is applied to a periodmeter, the digital output of which is input to the XDS-9300 computer for analysis and display. The absolute accuracy of the period measurement is ... |
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| Summary of Cutoff Rigidities Calculated with the International Geomagnetic Reference Field for Various Epochs. |
26 MAY 1976 |
|
| Authors:
M. A. Shea; D. F. Smart; H. Carmichael; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MASS
|
| Tables of cosmic-ray cutoff rigidities using the trajectory-tracing technique are given for five Epochs of the geomagnetic field. These values have been determined utilizing the International Geomagnetic Reference Field with time derivatives applied so that the coefficients for the field model are appropriate for the following Epochs: 1955.0, 1965.0, 1966.5, 1970.0, and 1975.0. Each table includes the geographic coordinates and L value of each location together with the main cutoff ... |
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| Geomagnetic Effects: A Rapporteur Paper Prepared for the International Cosmic Ray Conference (14th), |
19 APR 1976 |
|
| Authors:
D. F. Smart; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MASS
|
| This paper presents a summary of the 23 scientific papers on the interaction of cosmic-rays and the geomagnetic field as presented at the 14th International Cosmic Ray Conference. These geomagnetic effects will be discussed from several different viewpoints, these viewpoints roughly ordered by the cosmic ray energies being considered. Starting at relativistic energies, we first consider the earth's geomagnetic field as a quiescent stable reference. Changing to lower energies we ... |
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| Comment on 'Kp Dependence on Sectors' by I. B. McDiarmid and E. E. Budzinski, |
MAR 1976 |
|
| Authors:
Leif Svalgaard; STANFORD UNIV CALIF INST FOR PLASMA RESEARCH
|
| A suggestion by McDiarmid and Budzinski that an annual variation of geomagnetic activity can explain a sector polarity asymmetry is shown not to be necessary. The correct explanation is that the Kp-index exhibits systematic errors that enhance the UT variation during Toward polarity and decreases the UT variation during Away polarity. |
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| Conditional Probabilities of the Geomagnetic Index A sub p. |
23 FEB 1976 |
|
| Authors:
Philip M. Pazich; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MASS
|
| Data of the geomagnetic index A sub p from 1932 to 1973 were used to determine the conditional probabilities for the occurrence of certain values of that index. The range of values was divided into three categories that approximately correspond to quiet, moderate, and disturbed levels of geomagnetic activity. Conditions applied were the category level of activity on the initial and subsequent day and the portion of the solar sunspot ... |
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| VLF Emissions Associated with Enhanced Magnetospheric Electrons. |
FEB 1976 |
|
| Authors:
Roger R. Anderson; Kaichi Maeda; IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
|
| During periods of geomagnetic disturbances, VLF emissions and enhancements of low energy electrons are simultaneously observed by the equatorial orbiting Explorer 45 satellite. These events are characterized by the following features: (1) the VLF emissions occur outside the plasmasphere in the nightside of the magnetosphere; (2) the VLF emissions consist of two frequency regimes, one below the local electron gyrofrequency f sub-g and the other above f sub-g; (3) the ... |
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| Evaluation of the Experimental Design and The Estimation of Parameters by Deep Crustal Electromagnetic Sounding Systems. |
1976 |
|
| Authors:
William R. Sill; Bruce D. Smith; Stanley H. Ward; UTAH UNIV SALT LAKE CITY DEPT OF GEOLOGY AND GEOPHYSICS
|
| The objective of this report is to quantitatively examine the problem determining parameters of a resistive layer in the earth's crust by electrical sounding methods. The advantages and disadvantages of a quantitive assessment of the resolution of model parameters is briefly examined. Particular electrical sounding methods considered here are; (1) magnetotelluric and audio magnetotelluric methods (MT-AMT); (2) direct current (DC) Schlumberger (VES) method; and (3) DC dipole-dipole sounding methods with ... |
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| Magnetostratigraphic and Geochronologic Calibration of Neogene Radiolarian Events, Tropical Pacific, |
1976 |
|
| Authors:
F. Theyer; C. Y. Mato; S. R. Hammond; HAWAII INST OF GEOPHYSICS HONOLULU
|
| The gross paleomagnetic polarity sequence recorded in deep-sea sediments has been clarified as far back in time as Late Oligocene using chronologically overlapping cores from the tropical Pacific. This research also provided the foundation for various authors to propose a Neogene paleomagnetic time-scale. Although this scale is still evolving, at least in part it corresponds well with similar scales based on marine magnetic anomalies and radiomagnetic dates from continental sections. ... |
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| Recalibration of Bartels' Geomagnetic Activity Indices Kp and ap to Include Universal Time Variations, |
DEC 1975 |
|
| Authors:
Leif Svalgaard; STANFORD UNIV CALIF INST FOR PLASMA RESEARCH
|
| The ap index (and derived indices) can be recalibrated using Mayuad's am-index to recover the correct Universal Time variations. Such variations were artificially removed in the original ap-index. A number of tests are performed to show that the correct index is capable of revealing the desired variations. These tests include comparisons of the UT-variations on days of opposite interplanetary magnetic sector polarity. A finding, that geomagnetic activity was considerably higher ... |
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| A Geomagnetic Data Collection Network. |
13 NOV 1975 |
|
| Authors:
Robert C. Snare; CALIFORNIA UNIV LOS ANGELES INST OF GEOPHYSICS AND PLANETARY PHYSICS
|
| The development of a data collection system and magnetic field instrumentation is described. |
|
| Magnetic and Bathymetric Profiles from the Central and Southeastern Pacific 10 deg N-45 deg S, 70 deg W-150 deg W, |
NOV 1975 |
|
| Authors:
D. W. Handschumacher; S. T. Okamura; P. K. Wong; HAWAII INST OF GEOPHYSICS HONOLULU
|
| Magnetic and bathymetric survey data are presented in profile format along tracklines. Sources for these data are: Hawaii Institute of Geophysics, University of Hawaii; Pacific Oceanographic Laboratories, National Oceanic and Atmospheric Administration; Project Magnet, U.S. Navy Oceanographic Office; Lamont-Doherty Geological Observatory, Colubmia University; and School of Oceanography, Oregon State University. Although tectonic interpretation of the data is not included, several features of the magnetic data analysis are discussed. |
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| Precipitation of Particles at Low and Middle Latitudes. |
01 AUG 1975 |
|
| Authors:
George A. Paulikas; AEROSPACE CORP EL SEGUNDO CALIF SPACE PHYSICS LAB
|
| The phenomenology and aeronomic effects of charged particle precipitation at middle and low latitudes are reviewed. This paper includes discussions of the behavior of quasi-trapped electrons observed at middle and low latitudes, the precipitation of protons from the ring current into the low latitude atmosphere, and a summary of the effects of the South Atlantic magnetic anomaly on charged particles trapped at low altitudes. A brief summary and review of ... |
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| Midlatitude Sector Effects. |
Aug 1975 |
|
| Authors:
Leif Svalgaard; STANFORD UNIV CALIF INST FOR PLASMA RESEARCH
|
| Analysis of several thousand days of data during the interval 1957-1974 of the horizontal component at three midlatitude stations shows no significant effect of different polarity of the interplanetary magnetic field. In particular the position of the Sq focus does not respond to the sector polarity. (Author) |
|
| Tables of Asymptotic Directions and Vertical Cutoff Rigidities for a Five Degree by Fifteen Degree World Grid as Calculated Using the International Geomagnetic Reference Field for Epoch 1965.0. |
17 JUL 1975 |
|
| Authors:
M. A. Shea; D. F. Smart; AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MASS
|
| Tables of asymptotic directions and vertical cutoff rigidities for a five degree by fifteen degree world grid are presented in this report. These values were obtained by the integration of vertically incident cosmic-ray trajectories through the International Geomagnetic Reference Field for Epoch 1965.0. The table of asymptotic directions contains the asymptotic latitudes and longitudes which specify the direction of approach, from interplanetary space, of a cosmic-ray particle. These asymptotic directions ... |
|
| The ROSCOE Manual. Volume 15. ambient geomagnetic field |
13 JUN 1975 |
70 pages |
| Authors:
Robert W. Lowen; Curtis A. Smith; GENERAL RESEARCH CORP SANTA BARBARA CA
|
| A preliminary model of the ambient geomagnetic field has been adopted for use in ROSCOE. The model fits a locally-best earth-centered dipole field in the battle space; this dipole field is then used for subsequent field evaluations and line tracings. Herein are presented derivations, flow diagrams, fortran listings, and a test problem and evaluation. The model is found to be both fast and accurate. |
|
| Pc1 and Pc5 Micropulsation Polarization Patterns. |
29 MAY 1975 |
|
| Authors:
John F. McClay ; AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MASS
|
| The position taken in this report is that the observable features of any pulsation or pulsation event are explained in terms of the physical properties of the eigenmodes of the system for a particular quasi-stationary state or a slowly varying sequence of quasi-stationary states. Discussed are: Field configuration of the eigenmodes for the resonance model; physical properties of polarization and magnetic energy density; latitudinal and diurnal variations in Pc4-5 H-D ... |
|
| Asymptotic Directions and Vertical Cutoff Rigidities for Selected Cosmic-Ray Stations as Calculated Using the International Geomagnetic Reference Field Model Appropriate for Epoch 1975.0. |
05 MAY 1975 |
|
| Authors:
M. A. Shea; D. F. Smart; AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MASS
|
| Tables of asymptotic directions and vertical cutoff rigidities for a selected set of cosmic-ray stations are presented. These values were obtained by the integration of vertically incident cosmic-ray trajectories through the International Geomagnetic Reference Field model adjusted for a 1975.0 Epoch. The table of asymptotic directions contains the asymptotic latitudes and longitudes that specify the direction of approach from interplanetary space of a cosmic-ray particle. These asymptotic directions are given ... |
|
| Use of Vertical Gradients for Interpretation of Gravimagnetic Anomalies (Ispolzovanie Vertikalnykh Gradientov dlya Interpretatsii Gravimagnitnykh Anomalii), |
MAY 1975 |
|
| Authors:
A. A. Lyubimov; DEFENSE MAPPING AGENCY AEROSPACE CENTER ST LOUIS AIR FORCE STATION MO TECHNICAL TRANSLATION SECTION
|
| This report elaborates on the methods possible for direct determinations of the vertical gradients and accelerated computations. It also discusses the advantages of vertical gradients; their direct measurement gives the most accurate initial data for interpretation. |
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| Asymptotic Directions and Vertical Cutoff Rigidities for Selected Cosmic-Ray Stations as Calculated Using the Finch and Leaton Geomagnetic Field Model. |
01 APR 1975 |
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| Authors:
M. A. Shea; D. F. Smart; AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MASS
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| Tables of asymptotic directions and vertical cutoff rigidities for a selected set of cosmic-ray stations are presented. These values were obtained by the integration of vertically incident cosmic-ray trajectories through the Finch and Leaton (Epoch 1955) quiescent model of the geomagnetic field. The table of asymptotic directions contains the asymptotic latitudes and longitudes that specify the direction of approach from interplanetary space of a cosmic-ray particle. These asymptotic directions are ... |
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Geomagnetism
