| An Introduction to the AFGL Magnetometer Network, |
APR 1979 |
|
| Authors:
David J. Knecht; Robert O. Hutchinson; Charles W. Tsacoyeanes; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
|
 | The seven-station magnetometer network of the Air Force Geophysics Laboratory is currently in continuous operation. Five data-collection stations (Newport, WA, Rapid City, SD, Camp Douglas, WI, Mount Clemens, MI, and Sudbury, MA) form a 3800-km east-west chain at 55 degrees N corrected geomagnetic latitude. Two others (Lompoc, CA, and Tampa, FL) are separated by 3800 km at 40 degrees N corrected geomagnetic latitude. The principal instruments, identical at all stations, ... |
|
| Stacked Squid Arrays. |
20 MAR 1979 |
|
| Authors:
George F. Hinton; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The described invention is briefly summarized as a means for increasing the sensitivity of Josephson Junction Cryogenic Magnetometers by unique design and construction of DC SQUID arrays. The SQUIDS are arrayed vertically and the sensitivity of each sensing point is increased by making an intimate, co-axial superposition of two or more two-junction SQUID loops using, for example, evaporated thin-film technology although fabrication is not limited solely to this technique. The ... |
|
| Assessment of Magnetospheric Processes of Importance in HANE. |
15 MAR 1979 |
|
| Authors:
J. B. Cladis; G. T. Davidson; W. E. Francis; L. L. Newkirk; M. Walt; LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CALIF
|
| Conditions in the unstable field-aligned current sheet above the auroral oval have been obtained from analyses of the electron and ion measurements on the S3-3 satellite. The measurements were obtained while the satellite was in and near the nominal region of the current sheet, remaining within a few degrees in invariant latitude, over a magnetic local-time interval of about 6 hours. Potential differences along the magnetic field, above and below ... |
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| Correlation Studies of Protonospheric Electron Content Over the U.S. Continent. |
06 MAR 1979 |
|
| Authors:
A. Shuval; J. A. Klobuchar; H. Soicher; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
|
| Measurements of the electron content of the earth's protonosphere, N sub p, defined here as the region above the height where Faraday rotation measurements of VHF signals are significant, have been compared from pairs of stations in North America. Results of studies of N sub p and of the variabilities from the monthly mean vlaues at station pairs show a lower correlation than expected. Correlation coefficients of total electron content ... |
|
| Geoelectric and Geomagnetic Studies. |
02 MAR 1979 |
|
| Authors:
Theodore R. Madden; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF EARTH AND PLANETARY SCIENCES
|
| The final six years of seventeen years of ONR sponsored research work at MIT in geoelectricity and geomagnetism is reviewed. The specific areas included magnetospheric studies and crustal magnetotelluric studies. The magnetospheric studies involved Alfven wave damping in the plasmasphere and its effect of the ULF background noise spectrum. The magnetotelluric studies included a low frequency magnetotelluric survey of New England and a thin sheet analysis that incorporates the effects ... |
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| Report on Peru Scintillation Tests- March 1978. |
22 JAN 1979 |
|
| Authors:
H. E. Whitney; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
|
| This report summarizes the occurrence of ionospheric scintillation observed during March 1978 scintillation tests conducted in Peru. The data are reduced and presented as was done in AFGL-TR-77-0282, 'Report on Peru Scintillation Tests - October 1976 and March 1977.' (Author) |
|
| Phase Space Coordinates of Long Lifetime Trapped Radiation from Stoermer Mapping. |
18 JAN 1979 |
|
| Authors:
Charles W. Dubs; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
|
| The concept of an 'essentially closed' manifold and several theorems on a plane mapping are introduced and applied to a 'Stoermer mapping' for a particle trapped in a dipole magnetic field. The trapped region is found to be divisible into many subregions in any one of which a particle forever remains confined. Alternatives are given to Dragt and Finn's interpretation that homoclinic points exist. A method is given of determining ... |
|
| Synoptic Charts of Coronal Holes and 9.1 CM Solar Data from May through August 1973, |
JAN 1979 |
|
| Authors:
Fred L. Wefer; Michael D. Papagiannis; Michael E. Van Steenberg; Terry M. Varner; BOSTON UNIV MASS DEPT OF ASTRONOMY
|
| The introduction reviews the geomagnetic disturbances due to high-speed solar wind streams produced by coronal holes and discusses the history of radio observations of coronal holes. In the main part of this work, using the central meridian column of the 9.1 cm Stanford solar radio maps, the authors constructed synoptic charts emphasizing temperatures near the quiet solar disk level. Synoptic charts were made for Carrington Rotations 1601-1605 (May - August ... |
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| Earth Ground System Design and Evaluation. |
JAN 1979 |
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| Authors:
John D. Riley; NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J
|
| Model K2-10 ground rods were installed, tested, and evaluated with copper-clad steel (CCS) and CCS salt-enhanced (CCSS) rods at field sites and the National Aviation Facilities Experimental Center (NAFEC) for comparison and determination if they meet the manufacturer's specifications in high-, medium-, and low-resistivity soils under arid and wet conditions through a year of seasonal change. It was determined at most sites that the XIT-rod-to-earth impedance remained lower than the ... |
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| The Influence of Geomagnetic Activity on the Day-to-Day Variability of the Ionospheric F-Region. |
JAN 1979 |
|
| Authors:
Michael Mendillo; Francis X. Lynch; BOSTON UNIV MASS DEPT OF ASTRONOMY
|
| This report describes a summary of preliminary findings concerning the search for a geomagnetic activity control of ionospheric variability. The results are encouraging in that the division of a month's worth of F-region data into a geomagnetically ordered hierarchy may lead to a satisfactory forecasting scheme for day-to-day variability. The five geomagnetically quiet days of the month (QQ-days) were seen to behave in a consistent way for seasons and stations ... |
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| Geofisica Internacional Volume 18. Number 3. 1 July 1979, |
1979 |
|
| Authors:
Adrian E. Scheidegger; B. V. Sanchez; Dieter Klaus; Ernesto Jauregui; Jamie Urrutia Fucugauchi; UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO MEXICO CITY INST DE GEOFISICA
|
|
| A Dynamical Model for the Onset of Magnetospheric Substorms. |
13 DEC 1978 |
|
| Authors:
P. L. Rothwell; G. K. Yates; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
|
| A model for the onset of magnetospheric substorms is developed based on the observations of Pytte et al (1976). North-south single-particle motion across the plasma sheet becomes instrumental in generating magnetic instabilities when the plasma sheet is sufficiently compressed. The number density times the square of the plasma sheet thickness is found to be the critical parameter (nl squared less than or equal to 8.1 x 10 to the 15th ... |
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| A Study to Relate Interplanetary Magnetic Field Parameters to Auroral Oval Phenomena. |
DEC 1978 |
|
| Authors:
Ching-I. Meng; Kinsey A. Anderson; CALIFORNIA UNIV BERKELEY SPACE SCIENCES LAB
|
| The first part of this report summarizes the major results of a study of auroral oval phenomena and interplanetary magnetic field. The second part presents an up-dated understanding on the auroral oval phenomena and their relation with the interplanetary magnetic field. It reviews research involved with direct and inferred determinations of the polar cap size and location, as well as their relationships with the interplanetary magnetic field. First, the progress ... |
|
| Notes on the 1978 Summer Study Program on Dynamo Models of Geomagnetism in Geophysical Fluid Dynamics at the Woods Hole Oceanographic Institution. |
NOV 1978 |
|
| Authors:
Willem V. R. Malkus; Mary Thayer; WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS
|
| This volume contains the manuscripts of research lectures by the eleven fellows of the summer program. Five of the lectures overlap significantly with the central summer theme of geomagnetism. The other six lectures cover a broad range of current G.F.D. topics from collective instability to strange attractors. Several of these research efforts are quite polished and probably will appear in journals soon. The middle half represent reports of sound progress ... |
|
| Notes on the 1978 Summer Study Program on Dynamo Models of Geomagnetism in Geophysical Fluid Dynamics at the Woods Hole Oceanographic Institution. Volume II. |
NOV 1978 |
|
| Authors:
Willem V. R. Malkus; Mary C. Thayer; WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS
|
| This volume contains the manuscripts of research lectures by the eleven fellows of the summer program. Five of the lectures overlap significantly with the central summer theme of geomagnetism. The other six lectures cover a broad range of current G.F.D. topics from collective instability to strange attractors. |
|
| Description of the Space Test Program P78-2 Spacecraft and Payloads. |
31 OCT 1978 |
|
| Authors:
John R. Stevens; Alfred L. Vampola; SPACE AND MISSILE SYSTEMS ORGANIZATION LOS ANGELES CALIF
|
| The SAMSO Space Test Program is acquiring the P78-2 spacecraft from the Martin Marietta Company. Data from the payloads on board the P78-2 spacecraft will be used to help understand the phenomena of spacecraft charging. The payloads include particle and electromagnetic field monitors as well as contamination monitors and transient detectors. The report describes the general spacecraft charging program and how the P78-2 spacecraft contributes to the general program. An ... |
|
| Study and Analysis of Equatorial Irregularities, Total Electron Content, and Scintillations. |
OCT 1978 |
|
| Authors:
Santimay Basu; Sunanda Basu; James Johanson; Eileen MacKenzie; M. Patricia Hagan; EMMANUEL COLL BOSTON MASS
|
| The following are among the topics studied. (1) The nature of electrojet irregularities responsible for daytime VHF scintillations in the equatorial region. The times of onset and decay of VHF scintillations are shown to correspond closely with the times of onset and decay of type 2 irregularities deflected by 50 MHz radar and E sub sq echoes on ionograms. (2) The spatial localization of nighttime irregularities detected by scintillation and ... |
|
| A Spacedreceiver Data Analysis Technique for Simultaneously Estimating Anisotropy and Pattern Drifts in Radio Wave Transmission Experiments. |
30 SEP 1978 |
|
| Authors:
Charles L. Rino ; Robert C. Livingston; SRI INTERNATIONAL MENLO PARK CA
|
| This report describes a technique for simultaneously estimating the anisotropy and relative drift of the diffraction pattern in a radio-wave transmission experiment. The technique was developed to analyze the spaced-receiver data from the Wideband Satellite. Radio-wave scintillation data exhibit a complicated dependence on the propagation geometry relative to the magnetic field. Thus, we have also developed a theory that relates the anisotropy of the measured diffraction pattern to the anisotropy ... |
|
| Magnetometer Using a Field Controlled Oscillator, the Oscillator Core Being Maintained Near Its Curie Point. |
15 AUG 1978 |
|
| Authors:
James L. Kirkland; DEPARTMENT OF THE NAVY WASHINGTON D C
|
| A magnetometer wherein inductance of a resonant circuit is made sensitive to changes in magnetic field to vary an oscillator operating frequency. The magnetometer utilizes a ferromagnetic sensor element that is characterized by high permeability in weak magnetic fields when the element is maintained at predetermined elevated temperatures near the Curie point of the element material and also exhibits a hysteresis curve having a steep slope in the region of ... |
|
| Ionospheric Modeling and Propagation Analysis. |
JUL 1978 |
|
| Authors:
David C. Miller; Joseph Gibbs; ARCON CORP WALTHAM MA
|
| This report describes several studies performed toward improving our knowledge of the properties of High-Frequency communication circuits. These studies included the development of three dimensional electron density models and the analysis of various propagation modes in the ionosphere. Several vertical electron density models were constructed that proved to be useful in both global and polar region HF applications. Improvements were made to existing models for individual ionospheric layer parameters. Some ... |
|
| Ideal Solution of an Inverse Normal Mode Problem with Finite Spectral Data. |
JUN 1978 |
|
| Authors:
Victor Barcilon; CHICAGO UNIV ILL DEPT OF GEOPHYSICAL SCIENCES
|
| The problem of reconstructing the density of a vibrating string given the first N eigenfrequencies for two vibrating configurations admits an infinite number of solutions. Among all such strings compatible with the truncated data set, we define the ideal string to be that string for which a weighted average of the density is minimum. We prove that this ideal string must have a finite number of degrees of freedom and ... |
|
| Power Spectra of Geomagnetic Fluctuations between 0.1 and 10.0 Hz. |
JUN 1978 |
|
| Authors:
John Michael Barry; NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
|
| An optically pumped Cesium vapor magnetometer was used to measure the temporal fluctuations of the total geomagnetic field at Monterey, California. Power spectra were obtained from these recordings for the frequency range 0.1-10 Hz. Measurements were made during the month of April 1978 with the Kp index varying from 0+-8+. The power spectra obtained displayed a characteristic -20 dB/decade slope from 0.1-2.0 Hz and were essentially flat between 2.0-10 Hz. ... |
|
| Fabrication and Test Report. |
16 APR 1978 |
|
| Authors:
Robert C. Snare; CALIFORNIA UNIV LOS ANGELES INST OF GEOPHYSICS AND PLANETARY PHYSICS
|
| The modification fabrication and test of magnetometers and digital equipment is described. (Author) |
|
| Evaluation of a Triaxial SQUID Magnetometer Designed for Use as an ELF Magnetic Antenna. |
APR 1978 |
|
| Authors:
S. A. Wolf; R. J. Dinger; J. Goldstein; NAVAL RESEARCH LAB WASHINGTON D C
|
| A triaxial SQUID magnetometer system has been proposed for use in a submarine towed ELF receiving antenna system. This report describes the testing of the magnetometer system to determine the magnetic orthogonality among the channels of the system, the instrument noise level and responsivity. The other parameters of the system, mostly electrical in nature, had been determined previously. (Author) |
|
| The DREP 'QMIS' Geomagnetic Micropulsation Data Records, 1969 to 1974 - Their Content and Interpretation. |
APR 1978 |
|
| Authors:
J. A. Shand; DEFENCE RESEARCH ESTABLISHMENT PACIFIC VICTORIA (BRITISH COLUMBIA)
|
| A set of 25 digital magnetic tapes contain the better part of five years' single-component quantitative geomagnetic micropulsation information recorded at a quiet site in Southern Alberta. These tapes, derived from the original records, now exist in a standard, readable format. (Author) |
|
| The South Ocean and Antarctica According to Gravimetric Data, |
23 FEB 1978 |
|
| Authors:
P. A. Stroyev; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
|
|
| Auroral Data Analysis. |
04 JAN 1978 |
|
| Authors:
J. David Winningham; Walter J. Heikkila ; Gordon G. Shepherd; TEXAS UNIV AT DALLAS RICHARDSON
|
| Three papers have been published in journals. Each deals with the effects produced by auroral particles on the ionosphere and atmosphere and in turn with how the dynamics of auroral particles is influenced by terrestrial and interplanetary magnetic activity. |
|
| Geofisica Internacional, Volume 17, Number 4, 1977-1978, |
1978 |
|
| Authors:
R. Alvarez; C. Flores Luna; S. K. Singh; J. Urrutia; UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO MEXICO CITY INST DE GEOFISICA
|
|
| Effect of the Ionosphere on Space and Terrestrial Systems |
1978 |
|
| 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; |
|
| VLF Transmission Induced Slot Electron Precipitation. |
05 DEC 1977 |
|
| 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 ... |
|
| Stimulation of ULF (Ultra-Low-Frequencies) Geomagnetic Pulsations by Controlled VLF (Very-Low-Frequencies) Transmissions into the Magnetosphere |
DEC 1977 |
|
| 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 ... |
|
| Study of Plasma Flow Near the Earth's Plasmapause. |
28 NOV 1977 |
|
| 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 ... |
|
| Dyadic Green's Function for a Two-Layered Earth. |
NOV 1977 |
|
| 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 ... |
|
| Low Latitude PC 3 and PC 4 Micropulsations. |
28 OCT 1977 |
|
| Authors:
Victor L. Badillo; MANILA OBSERVATORY (PHILIPPINES)
|
| 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) |
|
| Study of Selected Events in the Baikal Rift Zone in a Seismic Discrimination Context. |
17 OCT 1977 |
|
| 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 ... |
|
| 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. ... |
|
| 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 ... |
|
| 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 ... |
|
| Inter-Relationships of Solar and Interplanetary Plasma, Magnetic Fields and Energetic Particles Relevant to the Prediction of Solar-Terrestrial Disturbances, |
29 JUL 1977 |
|
| 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 ... |
|
| Closed Form Magnetic Quarter Orbit Switch Point Solution. |
15 JUL 1977 |
|
| 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 ... |
|
| 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 ... |
|
| 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 ... |
|
| Stimulation of Pc 1 Micropulsations by Controlled VLF Transmissions. |
07 APR 1977 |
|
| Authors:
Harry C. Koons; AEROSPACE CORP EL SEGUNDO CALIF SPACE SCIENCES LAB
|
| 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 ... |
|
| 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 ... |
|
| 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 ... |
|
| 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 ... |
|
| 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 ... |
|
| 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 ... |
|
| 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 ... |
|
| 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 ... |
|
Geomagnetism
