| Solar Flares and Magnetospheric Particles: Investigations Based upon the ONR-602 and ONR-604 Experiments |
15 OCT 92 |
131 pages |
| Authors:
John P. Wefel; T. G. Guzik; LOUISIANA STATE UNIV BATON ROUGE DEPT OF PHYSICS AND ASTRONOMY
|
 | The study of solar flares, and the interaction of solar flare radiations with the geospace environment, is one of the most fundamental investigations in space science. Involved are basic questions about the mechanism for energy generation in the flare region, the conversion of this energy into high energy charged particles, neutrons, x-rays and gamma rays, the interplanetary propagation of the particles to Earth, the access of these particles to the ... |
|
| What Supports the Weight of the Ionosphere |
05 OCT 92 |
10 pages |
| Authors:
Francis S. Johnson; TEXAS UNIV AT DALLAS RICHARDSON
|
| This paper discusses the various physical processes which support the weight of the ionosphere. First, the investigation discusses the situation at the magnetic equator where the geomagnetic field is horizontal and then later discusses the mid-latitude region. It is found that at the magnetic equator, the different velocities of the ions and electrons creates a polarization current and subsequent electric field. When collisions are added, this provides a drag on ... |
|
| Earth Observing System: Information on NASA's Incorporation of Existing Data Into EOSDIS |
25 SEP 92 |
13 pages |
| Authors:
GENERAL ACCOUNTING OFFICE WASHINGTON DC INFORMATION MANAGEMENT AND TECHNOLOGY DIV
|
| NASA plans to include a variety of data in the early EOSDIS, including reprocessed versions of certain key large-volume data sets that have been collected over many years. However, few of the data sets earmarked for reprocessing will be sufficiently reworked to be available for users to test early EOSDIS capabilities and provide feedback. Although EOSDIS Version 0 is scheduled to become operational in 1994, none of the six large ... |
|
| Force Balance Near an X Line Along Which E . J < 0 |
15 SEP 92 |
11 pages |
| Authors:
L. R. Lyons; D. C. Pridmore-Brown; AEROSPACE CORP EL SEGUNDO CA ENGINEERING AND TECHNOLOGY GROUP
|
| Observations suggest that plasma can occasionally be transferred from closed to open field lines in the Geomagnetic tail during periods when the separatrix between open and closed field lines moves rapidly toward decreasing latitudes. Such transfer would require E (dot) J greater than 0 along the distant tail X line (E being the electric field and J the current density), and it would give important information on the physical processes ... |
|
| Geophysical Investigation at Dugway Proving Ground, Utah |
SEP 92 |
74 pages |
| Authors:
Jose L. Llopis; Jeffery S. Zawila; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| Results of a comprehensive, integrated geophysical investigation of eleven suspected Solid Waste Management Units (SWMU's) at Dugway Proving Ground (DPG), Utah, are presented. DPG has been in operation since 1942 and was originally established for chemical and biological warfare testing. As a result of this activity, chemically and biological contaminated materials were generated and disposed of at the installation. Based on historical and visual information, eleven sites containing suspected SWMU's, ... |
|
| The Propagation of Super-Events from 03-35 AU, |
03 AUG 1992 |
|
| Authors:
W. Droge; R. Muller-Mellin; E. W. Cliver; PHILLIPS LAB HANSCOM AFB MA
|
 | Super-events are long-lasting enhancements of the interplanetary particle population observed between 0.3 and 35 AU. They appear simultaneously in electrons up to 10 MeV and nucleons up to 70 MeV/N and differ distinctly from known intensity increases due to single solar flare particle events, corotating events, and ESP-events. Their onset and decay is much longer than for flare-associated events, and they remain between two and seven orders of magnitude above ... |
|
| The Effects of Magnetic Storm Phases on F-Layer Irregularities from Auroral to Equatorial Latitudes |
30 JUN 92 |
7 pages |
| Authors:
Jules Aarons; Michael Mendillo; BOSTON UNIV MA CENTER FOR SPACE PHYSICS
|
| The review of equatorial data relative to F-layer irregularities continued during this period with an emphasis in this quarter on the results of a long series of optical measurements. The study uses the largest optical data base yet obtained of equatorial airglow depletions to describe such observational features of irregularity plume onset and development under different seasonal and geomagnetic conditions. We are most interested in the data showing the extreme ... |
|
| Investigation of Ring Current/Storm Dynamics: Preliminary Results |
30 JUN 92 |
38 pages |
| Authors:
H. L. Collin; J. B. Cladis; J. M. Quinn; LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
|
| This study outlines the achievements of the second year of work on data acquired by the Lockheed Ion Mass Spectrometer (IMS-LO), one of the space radiation group of instruments on the Combined Release and Radiation Effects Satellite (CRRES). The purpose of IMS-LO is to study the low energy (110eV-35 keV) ion component of the current plasma. The primary data processing is almost complete, as is the construction of databases of ... |
|
| Integral Probability of Auroral Electron Flux Events from SSJ/4 DMSP F9 Electron Measurements |
18 MAY 92 |
32 pages |
| Authors:
David A. Hardy; Khaled H. Bounar; PHILLIPS LAB HANSCOM AFB MA
|
| A study has been completed to determine the probability of observing different levels of auroral electron precipitation both within fixed spatial elements in magnetic local time and corrected geomagnetic latitude, and within spatial elements when the magnetic local time is fixed but the latitude range can be varied. The auroral electron precipitation probability is defined for a series of thresholds in electron average energy and electron energy flux as a ... |
|
| The Semiannual Variation of Great Geomagnetic Storms and the Postshock Russell-McPherron Effect Preceding Coronal Mass Ejecta |
03 MAR 92 |
5 pages |
| Authors:
N. U. Crooker; E. W. Cliver; B. T. Tsurutani; PHILLIPS LAB HANSCOM AFB MA
|
| The occurrence rate of great geomagnetic storms displays a pronounced semiannual variation. Of the forty-two great storms during the period 1940-1990, none occurred during the solstitial months of June and December, and 40% (17) occurred during the equinoctial months of March and September. This suggests that the semiannual variation found by averaging indices is not the result of some statistical effect superposed on the effects of random storm occurrence but ... |
|
| Persistence of Auroral Electron Flux Events from DMSP/F9 Electron Measurements |
31 JAN 92 |
54 pages |
| Authors:
K. H. Bounar; W. J. McNeil; RADEX INC BEDFORD MA
|
| The persistence of auroral electron activity is examined and correlated to the geomagnetic activity, which is measured by the Kp index. To study this correlation the superposed epoch analysis technique was implemented. Epoch zero is the time at which Kp values persisted above a specified threshold value for a specified duration. It was found that a high correlation between enhanced Kp and the number of bright arcs can be achieved ... |
|
| Observations of High Frequency and High Wavenumber Solar Oscillations |
92 |
11 pages |
| Authors:
D. N. Fernandes; P. H. Scherrer; T. D. Tarbell; A. M. Title; STANFORD UNIV CA CENTER FOR SPACE SCIENCE AND ASTROPHYSICS
|
| Doppler shift measurements of the Na Di absorption line have revealed solar oscillations in a new regime of frequency and wavenumber. Oscillations of vertical velocities in the temperature minimum and low chromosphere of the Sun are observed with frequencies ranging up to 9.5 mHz. The fundamental modes appear with wavenumbers up to 5.33 Mm-1 (equivalent spherical harmonic degree, 3710). We find no evidence for chromospheric modes of 3 minute period. ... |
|
| The Effects of Magnetic Storm Phases on F-Layer Irregularities from Auroral to Equatorial Latitudes |
92 |
4 pages |
| Authors:
Jules Aarons; Michael Mendillo; BOSTON UNIV MA CENTER FOR SPACE PHYSICS
|
| The review of equatorial data relative to F-layer irregularities continued during this period with an emphasis in this quarter on determining the effects of localized effects on the generation of F-region irregularities. The study compares initially for one month TEC and scintillation data for Manila, the Philippines, Palehau, Hawaii, Tepei, Taiwan, and Osan, Korea all in the Pacific Sector. We are working on airglow depletion data taken in Brazil over ... |
|
| Coordinate Systems for Space and Geophysical Applications |
11 DEC 91 |
76 pages |
| Authors:
K. H. Bhavnani; R. P. Vancour; RADEX INC BEDFORD MA
|
| Many coordinate systems used at Phillips Laboratory, Hanscom AFB, for space and geophysical applications are described. This document describes astronomical, orbital, and geomagnetic systems, and special emphasis is given to magnetospheric coordinates in which radiation belt particle investigations may be made. An extensive list of terms and abbreviations is included. These coordinate systems are identified by their origins and the primary and secondary reference axes, which allows them to be ... |
|
| The Joint US/UK 1990 Epoch world Magnetic Model |
OCT 91 |
222 pages |
| Authors:
John M. Quinn; Rachel J. Coleman; Michael R. Peck; Stephen E. Lauber; NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS
|
| A detailed summary of the data used, analyses performed, modeling techniques employed, and results obtained in the course of the 1990 Epoch World Magnetic Modeling effort are given. Also, use and limitations of the GEOMAG algorithm are presented. Charts and tables related to the 1990 World Magnetic Model (WMM-90) for the Earth's main field and secular variation in Mercator and polar stereographic projections are presented along with useful tables of ... |
|
| Electric Utility Industry Experience with Geomagnetic Disturbances |
SEP 91 |
93 pages |
| Authors:
P. R. Barnes; D. T. Rizy; F. M. Tesche; E. R. Taylor Jr; OAK RIDGE NATIONAL LAB TN
|
| A geomagnetic disturbance (GMD) by its nature occurs globally and almost simultaneously. Severe geomagnetic storms cause problems for electric power systems. The vulnerability of electric power systems to such events has apparently increased during the last 10 to 20 years because power system transmission lines have become more interconnected and have increased in length and because power systems are now operated closer to their limits than in the past. In ... |
|
| Investigation of Ring Current/Storm Dynamics |
31 AUG 91 |
86 pages |
| Authors:
H. L. Collin; J. B. Cladis; J. M. Quinn; LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
|
| This study outlines the achievements of the first year of work on data acquired by the Lockheed Ion Mass Spectrometer (IMS-LO), one of the space radiation group of instruments on the Combined Release and Radiation Effects Satellite (CRRES). The purpose of IMS-LO is to study the low energy (110eV-35 keV) ion component of the ring current plasma. The primary data processing is proceeding rapidly, as is the construction of databases ... |
|
| Conditional Climatology of Ap: The Relationship between Various Solar Events (Surges, Prominences, Filaments, Radio Bursts, X-Ray Episodes) and Geomagnetic Storms |
AUG 91 |
56 pages |
| Authors:
Donald L. Wilson; AIR FORCE ENVIRONMENTAL TECHNICAL APPLICATIONS CENTER SCOTT AFB IL
|
| This report is a continuation of USAFETAC/TN-90/001 (AD-A222574). This report documents the relationship between Goettingen's planetary geomagnetic index (Ap) and various other solar events, such as surges, prominences, filaments, radio bursts and X-ray events. The study is based on solar and Ap data with an 11-year period of record (1975 to 1986--Solar Cycle 21). Solar reports were merged with 3-hour Ap values for 7 days after each event. The resultant ... |
|
| Development of a Magnetospheric Specification Model. Volume 2: Appendices A, B, C, D, E |
30 JUN 91 |
|
| Authors:
J. W. Freeman; R. A. Wolf; R. W. Spiro; G-h. Voigt; B. A. Hausman; RICE UNIV HOUSTON TX DEPT OF SPACE PHYSICS AND ASTRONOMY
|
| Rice University has developed a practical computer model that is capable of specifying electron and ion fluxes in the middle magnetosphere during geomagnetic storms. The model, called the Magnetospheric Specification Model (MSM), used ground-based and satellite data from the Space Forecast Center- Environment Data Base to establish initial and boundary conditions and to determine input parameters for the magnetic and electric field models. These input values are updated every 15 ... |
|
| Development of a Magnetospheric Specification Model. Volume 3: Appendices F and G |
30 JUN 91 |
|
| Authors:
J. W. Freeman; R. A. Wolf; R. W. Spiro; G-h. Voigt; B. A. Hausman; RICE UNIV HOUSTON TX DEPT OF SPACE PHYSICS AND ASTRONOMY
|
| Rice University has developed a practical computer model that is capable of specifying electron and ion fluxes in the middle magnetosphere during geomagnetic storms. The model, called the Magnetospheric Specification Model (MSM), used ground-based and satellite data from the Space Forecast Center- Environment Data Base to establish initial and boundary conditions and to determine input parameters for the magnetic and electric field models. These input values are updated every 15 ... |
|
| Residual Total Field Magnetic Anomaly Map of NOARL's Observatory |
APR 91 |
|
| Authors:
C. R. Estes; W. E. Avera; NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS
|
| The purpose of this survey is to create an accurate residual magnetic contour map of the Magnetic Observatory area at Stennis Space Center. Measurements were completed covering the observatory grounds. A map of the magnetic residuals is presented. |
|
| The Effects of Magnetic Storm Phases on F-Layer Irregularities from Auroral to Equatorial Latitudes |
31 MAR 91 |
|
| Authors:
Jules Aarons; Michael Mendillo; BOSTON UNIV MA CENTER FOR SPACE PHYSICS
|
|
| Development of a Numerical Scheme to Predict Geomagnetic Storms after Intense Solar Events and Geomagnetic Activity 27 Days in Advance |
FEB 91 |
|
| Authors:
S-i. Akasofu; Li-Her Lee; ALASKA UNIV FAIRBANKS GEOPHYSICAL INST
|
| The modern geomagnetic storm prediction scheme should be based on a numerical simulation method, rather than on a statistical result. Furthermore, the scheme should be able to predict the geomagnetic storm indices, such as the Dst and AE indices, as a function of time. By recognizing that geomagnetic storms are powered by the solar wind-magnetosphere generator and that its power is given in terms of the solar wind speed, the ... |
|
| The Role of Hydromagnetic Waves in the Magnetosphere and the Ionosphere |
31 JAN 91 |
|
| Authors:
Spencer Kuo; POLYTECHNIC INST OF NEW YORK BROOKLYN DEPT OF ELECTRICAL ENGINEERING AND COMP UTER SCIENCE
|
| Four research areas were investigated: (1). the propagation and coupling of hydromagnetic waves in the magnetosphere. The coupled hydromagnetic equations in the dipole model of the magnetosphere were solved numerically. A reconstruction of the long period waves in an actual geomagnetic storm was demonstrated (2). non-linear wave-particle interactions in the magnetosphere. Anomalous cross-field diffusion of trapped energetic protons may result in proton precipitation in the equatorial region; (3). the filamentation ... |
|
| Average Height-Integrated Joule Heating Rates and Magnetic Deflection Vectors Due to Field-Aligned Currents during Sunspot Minimum |
Jan 1991 |
17 pages |
| Authors:
F J Rich; M S Gussenhoven; D A Hardy; E Holeman; PHILLIPS LAB HANSCOM AFB MA
|
| Reprint: Average Height-Integrated Joule Heating Rates and Magnetic Deflection Vectors Due to Field-Aligned Currents during Sunspot Minimum. |
|
| Using Seafloor Arrays to Measure Sediment Seismoacoustic and Geotechnical Pr operties |
91 |
|
| Authors:
Robert D. Stoll; LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES NY
|
| In this paper a robust seismic technique for remote sensing of certain properties such as p- and s-wave velocity and attenuation as a function of depth in the uppermost sediments (25 to 50 m below the seafloor) is described. The technique utilizes an impulsive source and an array of gimbaled geophones sensitive to vertical and horizontal velocity. Both the source and receivers are deployed on the seafloor, and so far, ... |
|
| A Predictive Geomagnetic Field Model for Epoch 1990.5 |
AUG 90 |
|
| Authors:
M. G. McLeod; NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS
|
| A predictive model of the geomagnetic field for epoch 1990.5 has been developed. The model is based on the DGRF model for 1980.5 updated to 1990.5 by use of a secular variation model for 1980.0 developed at (NOARL). The NOARL secular variation model is based upon annual means of vector geomagnetic field components from 73 magnetic observatories for years 1976.5 through 1983.5. The predictive model is of degree and order ... |
|
| Development of a Magnetospheric Specification Model. Volume 1 |
30 JUN 90 |
|
| Authors:
J. W. Freeman; R. A. Wolf; R. W. Spiro; G-h. Voigt; B. A. Hausman; RICE UNIV HOUSTON TX DEPT OF SPACE PHYSICS AND ASTRONOMY
|
| Rice University has developed a practical computer model that is capable of specifying electron and ion fluxes in the middle magnetosphere during geomagnetic storms. The model, called the Magnetospheric Specification Model (MSM), used ground-based and satellite data from the Space Forecast Center- Environment Data Base to establish initial and boundary conditions and to determine input parameters for the magnetic and electric field models. These input values are updated every 15 ... |
|
| Report of a Workshop on the Geoelectric and Geomagnetic Environment of Continental Margins Held in Arlington, Virginia on November 1989 |
APR 90 |
47 pages |
| Authors:
A. D. Chave; J. R. Booker; C. S. Cox; P. L. Gruber; L. W. Hart; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB
|
| This report discusses basic research needs in electromagnetic (EM) geophysics relevant to one endeavour identified as important science issue and having a significant impact on Navy nonacoustic ASW surveillance programs. A major ASW emphasis has been placed on long range, deep ocean surveillance using passive acoustics and the subsequent tactical localization of submerged targets using passive and active acoustics or airborne magnetic anomaly detection (MAD). Because of recent and dramatic ... |
|
| Conditional Climatology of Ap: The Relationship between Solar Flares and Geomagnetic Storms |
FEB 90 |
|
| Authors:
Donald L. Wilson; Roger T. Edson; AIR FORCE ENVIRONMENTAL TECHNICAL APPLICATIONS CENTER SCOTT AFB IL
|
| This report documents a study of USAFETAC's optical solar flare database and its relationship to Gottingen's planetary geomagnetic index (Ap). The study was based on solar flare data with an 11-year period of record (1975 to 1986--Solar Cycle 21). After solar flares and Ap indices were studied separately, more than 27,000 flare reports were merged with 3-hour Ap values for 7 days after each flare. The resultant dataset was analyzed ... |
|
| Evaluation of Magnetospheric Internal Magnetic Field models and Existing Software |
31 JAN 90 |
|
| Authors:
C. E. Jordon; J. N. Bass; RADEX INC BEDFORD MA
|
| In preparation for analysis of the CRRES databases (to be taken from 1990 to 1995) and, in particular, for an updated static radiation belt model, a comparison has been made of four magnetospheric internal magnetic field models. Since there is interest in radiation belt models out to geosynchronous altitudes, it will be necessary to consider the external magnetic field models as well, but for now just the internal models will ... |
|
| Digisonde at Sondrestrom to Monitor the Ionospheric Polar Cap and Cusp Region |
JAN 90 |
|
| Authors:
Geoffrey Crowley; Bodo W. Reinisch; David F. Kitrosser; LOWELL UNIV MA CENTER FOR ATMOSPHERIC RESEARCH
|
| In July 1989, the Air Force meridional chain of Digisondes was completed by the installation of a system in Sondrestromfjord, Greenland (66.98 deg N, 50.94 deg W). In this report we describe the Sondrestrom site and instrument, and the relationship between Sondrestrom and the other AF sites. We also established the importance of this site by describing its geophysically unique features. Finally, some of the first measurements from Sondrestrom are ... |
|
| On the Significance of the Magnetospheric Effects in the Analysis of the Ground-Level Solar Cosmic Ray Event on 7 December 1982 |
Jan 1990 |
5 pages |
| Authors:
E O Flueckiger; E Kobel; D F Smart; M A Shea; PHILLIPS LAB HANSCOM AFB MA
|
|
| Processing of DMSP Magnetic Data and Its Use in Geomagnetic Field Modeling |
NOV 89 |
|
| Authors:
J. R. Ridgway; T. J. Sabaka; D. Chinn; R. A. Langel; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIG HT CENTER
|
| The DMSP F-7 satellite is an operational Air Force meteorological satellite which carried a magnetometer for geophysical measurements. The magnetometer was located within the body of the spacecraft in the presence of large spacecraft fields. In addition to stray magnetic fields, the data have inherent position and time inaccuracies. Algorithms were developed to identify and remove time varying magnetic field noise from the data. Techniques developed for Magsat were then ... |
|
| Direction-of-Arrival Calculations at VLF/LF (Very Low Frequency/Low Frequency) |
AUG 89 |
|
| Authors:
R. A. Pappert; L. R. Hitney; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
|
| A modification of an earlier program has been used to calculate direction-of-arrival (DOA) errors due to geomagnetic field effects at San Diego for the following VLF/LF transmitters; Annapolis (21.4 kHz), Lualualei (23.4 kHz), Cutler (24 kHz), Jim Creek (24.8 kHz), and Silver Creek (48.5 kHz). The calculations have been compared with corresponding measurements of Stang and Davis. The program can be used for both laterally homogeneous and inhomogeneous guides and ... |
|
| Development of Computer Codes to Model Dynamics of the Earth's Magnetosphere |
APR 89 |
|
| Authors:
Daniel W. Swift; ALASKA UNIV FAIRBANKS GEOPHYSICAL INST
|
| The objective of the research has been to develop models of plasma processes in the earth's magnetosphere and ionosphere to understand processes responsible for auroral and magnetic phenomena. One major accomplishment has been the tentative identification of the process for generation of the electric potentials that accelerate auroral electrons. Another major accomplishment is a numerical model of auroral precipitation. The simulation indicate that anomalous resistivity plays little role in electron ... |
|
| Geomagnetic Disturbances |
JAN 89 |
|
| Authors:
Philip H. Scherrer; STANFORD UNIV CA CENTER FOR SPACE SCIENCE AND ASTROPHYSICS
|
| Investigations have included observations and analysis of the solar and interplanetary quantities relevant to geomagnetic activity. The operation of the Wilcox Solar Observatory and analysis of the synoptic observations of magnetic fields has constituted a significant part of the effort. Emphasis has been to attempt to understand the timing and severity of geomagnetic disturbances by understanding the solar mechanisms responsible for the origin of solar wind variations. Keywords: Large scale ... |
|
| Study of Magnetic Reconnection |
NOV 88 |
|
| Authors:
R. L. Stenzel; W. Gekelman; J. M. Urrutia; CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS
|
| This research studied magnetic reconnection in a laboratory setting. (Magnetic reconnection is considered to be the primary cause of substorms.) It was found possible to trigger magnetic reconnection through the ion tearing mode and associated magnetic and particle properties were studied in detail. A summary is given of the lessons learned in regard to laboratory experiments on magnetic reconnection. Keywords: Magnetic storms; Magnetic reconnection; Substorms; Ion tearing mode. (jhd) ... |
|
| An Automatic Real-Time Geomagnetic Activity Monitoring System for the Mad and Adjacent Frequency Bands |
NOV 88 |
61 pages |
| Authors:
A. Bernardi; A. C. Fraser-Smith; O. G. Villard Jr; STANFORD UNIV CA SPACE TELECOMMUNICATIONS AND RADIOSCIENCE LAB
|
| A digital signal processing system for the measurement and monitoring of fluctuations of the Earth's magnetic field with frequencies in the range 0. 01-10 Hz, i.e., predominantly in the ultra-low frequency range (ULF; f somewhat 5 Hz), is described. It operates automatically under the control of a small computer and it generates indices by computing the logarithm of the average power in the frequency bands of interest, including in particular ... |
|
| The Effect of Pressure and Deviatoric Stress on Rock Magnetism |
31 OCT 88 |
|
| Authors:
Randolph J. Martin III; APPLIED RESEARCH ASSOCIATES INC SOUTH ROYALTON VT NEW ENGLAND DIV
|
| Experiments were performed on many rock types to examine the effect of pressure and stress on their magnetic properties. The effects of loading path on thermoremanent magnetization (TRM) and magnetic susceptibility were examined in detail. For samples with a TRM, initial loading produced a pronounced decrease in magnetization. As the specimen was unloaded, very little recovery in magnetization was observed resulting in a permanent demagnetization at the termination of the ... |
|
| Electric Fields in Earth Orbital Space |
19 OCT 88 |
|
| Authors:
W. P. Olson; K. A. Pfitzer; MCDONNELL DOUGLAS ASTRONAUTICS CO HUNTINGTON BEACH CA
|
| A model of the ground state magnetosphere was developed preciously and it is suggested that the basic magnetosphere is formed and maintained simply by the interaction of the solar wind with the geomagnetic field. It is known, however, that the magnetosphere responds dynamically to changes in the interplanetary magnetic field (IMF). Instead of the qualitative reconnection theory (which we believe is basically incorrect), we have examined this response in terms ... |
|
| AFGL Fiscal Year 1989. Air Force Technical Objectives Document |
OCT 88 |
|
| Authors:
AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
|
| The mission of the Air Force Geophysics Laboratory (AFGL) is to provide technology in the area of interactions between systems and their environment. As such it conducts research, exploratory and advanced development programs in the space, ionospheric, atmospheric, optical, and earth sciences. The six technical divisions conduct and support basic research, exploratory and advanced development programs in space physics, Ionospheric physics, Optical and infrared technology, Atmospheric sciences, Earth sciences, and ... |
|
| Final Report on Contract N00014-84-K-0523 (California University, Santa Barbara) |
30 SEP 88 |
|
| Authors:
Ken C. Macdonald; Stephen P. Miller; CALIFORNIA UNIV SANTA BARBARA
|
| The long range scientific objectives of this contract is to achieve an understanding of crustal generation processes in the South Atlantic, approached with a combined analysis of Sea Beam bathymetric data and sea surface magnetic field data. We are particularly interested in small offset features on the spreading axis, which have a surprisingly large role in altering the normal seafloor fabric and magnetic signature. Keywords: South Atlantic Ocean, Oceanic crust, ... |
|
| Time-Weighted Accumulations ap(Tau) and Kp(Tau) |
JUL 88 |
|
| Authors:
G. L. Wrenn; ROYAL AEROSPACE ESTABLISHMENT FARNBOROUGH (ENGLAND)
|
| The planetary geomagnetic indices Kp and ap are widely used in space geophysics. These provide an estimate of maximum magnetic perturbation within a 3-hour period. Many geophysical properties are clearly related to the indices, through energy transfer from a common disturbance source,but direct correlation is often lacking because of poor matching between the frequency of sampling and the physical response functions. The index ap(tau) is a simple accumulation of the ... |
|
| Three Dimensional Amplification of Seismic Waves by Alluvial Valleys of Arbitrary Shape. Part 1. Incident P and SV Waves |
JUL 88 |
|
| Authors:
K. R. Khair; S. K. Datta; A. H. Shah; COLORADO UNIV AT BOULDER DEPT OF MECHANICAL ENGINEERING
|
| This paper investigates amplification of ground motion in three dimensions due to arbitrarily shaped cylindrical alluvial valleys. A hybrid numerical method combining integral representation and finite element discretization is employed. The incident wave is either a plane P or SV wave, propagating at an arbitrary angle to the axis of the cylindrical valley. Numerical results showing significant dynamic amplification are presented for various angles of incidence and two different geometries ... |
|
| Summer Study Program in Geophysical Fluid Dynamics; Order and Disorder Planetary Dynamos |
MAY 88 |
|
| Authors:
Willem V. Malkus; Mary E. Berry; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| This volume contains the lectures of Stephen Childress on the kinematic properties of the 'fast' dynamo, one whose growth rate is insensitive to electrical conductivity. These novel studies and the extended seminar abstracts by Andrew Soward and others that follow offer assurance of more mechanistic understanding of evolving magnetic fields in stars and planets. The timely juxtaposition of Childress' lectures on kinematic fast dynamos and the seminars by Bruce Bayly ... |
|
| On the Dynamics of the Auroral Ionosphere during the Breakup of a Substorm |
01 MAR 88 |
|
| Authors:
Michael B. Silevitch; NORTHEASTERN UNIV BOSTON MA
|
| The research investigation described here concentrated on several dynamic features of substorm evolution during its breakup phase. More specifically, we focussed upon the development of a model for the propagation of the Westward Travelling Surge (WTS) as seen from the viewpoint of an active ionosphere. We also considered a mechanism for the generation of pi2 pulsations. An important feature of our approach is the natural coupling which exists between the ... |
|
| A Numerical Study of Baroclinic Circulation in Monterey Bay |
MAR 88 |
|
| Authors:
Barry L. Bruner; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The circulation of Monterey Bay is both variable and complex, and is likely to be significantly influenced by circulation in the adjacent California current. To study this circulation a two-layer, numerical model was used. The model was forced by inflow and outflow at an open boundary that connected the Pacific Ocean with the bay. Topography representing Monterey Canyon was included in the lower layer of the model. The effects of ... |
|
| Solar Flares and Magnetospheric Particles: Investigations Based upon the ONR-602 and ONR-604 Experiments |
10 FEB 88 |
|
| Authors:
John P. Wefel; LOUISIANA STATE UNIV BATON ROUGE DEPT OF PHYSICS AND ASTRONOMY
|
| Data from the ONR-602 experiment, obtained in a low altitude, polar orbit are being analyzed to investigate the composition, intensity levels and time variations of energetic charged particles both trapped within the Earth's magnetosphere and incident upon the magnetosphere from interplanetary space, particularly solar flare particles. The effort involves both data analysis/ interpretation and detailed modeling of the near-Earth environment. The research focusses on the 'global zones' of low energy ... |
|
| Field-Aligned Structure of the Storm Time Pc 5 Wave of November 14-15, 1979 |
01 FEB 88 |
|
| Authors:
K. Takahashi; P. R. Higbie; J. F. Fennell; E. Amata; AEROSPACE CORP EL SEGUNDO CA SPACE SCIENCES LAB
|
| Magnetic field data from the four satellites--SCATHA (P78-2), GOES 2, GOES 3, and GEOS 2--have been analyzed to examine the magnetic-field-aligned structure of a storm time Pc 5 wave which occurred on November 14-15, 1979. The wave had both transverse and compressional components. At a given instance, the compressional and the radial components oscillated in phase or 180 deg out of phase, and the compressional and the azimuthal components oscillated ... |
|
Geomagnetism
