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xii, 447 p. : 28 cm
Topic: Magnetopause
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170
Jun 17, 2010
06/10
by
Blum, R
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No Abstract Available
Topic: MAGNETOPAUSE
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198
May 23, 2011
05/11
by
Fuller-Rowell, T.J
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The goal of the proposed work was to understand the latitude structure of nitric oxide in the mesosphere and lower thermosphere. The problem was portrayed by a clear difference between predictions of the nitric oxide distribution from chemical/dynamical models and data from observations made by the Solar Mesosphere Explorer (SMEE) in the early to mid eighties. The data exhibits a flat latitude structure of NO, the models tend to produce at equatorial maximum. The first task was to use the...
Topics: MAGNETOPAUSE, COMPUTERIZED SIMULATION, MODELS, CALIBRATING, COMPUTER PROGRAMS, NIGHT
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Oct 29, 2009
10/09
by
NASA/Goddard Space Flight Center Scientific Visualization Studio
movies
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The plasmasphere is a region of ionospheric plasma which co-rotates with the Earth, carried by the magnetic field lines. The plasmapause marks the outer boundary of this region. This colder plasma is more easily moved by the electric fields created by strong solar storms. In the Halloween 2003 event, these fields convected some of the cold plasma out to the magnetopause (gray, semi-transparent surface) and reduced the size of the cold plasma region near the Earth. For this visualization, the...
Topics: HDTV, Plasmasphere, Space science, Location, Magnetopause, Space Weather, What -- Earth
Source: http://svs.gsfc.nasa.gov/goto?3051
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255
May 6, 2010
05/10
by
Bridge, H. S.; Egidi, A.; Jacobson, L.; Lazarus, A. J.; Lyon, E. F., II
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Plasma measurements on imp-a
Topics: EXPLORER 18 SATELLITE, MAGNETOPAUSE, PLASMAS (PHYSICS), EXPLORER XVIII SATELLITE, PLASMA
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May 28, 2011
05/11
by
Davies, Carol B.; Venkatapathy, Ethira
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The multi-dimensional self-adaptive grid code, SAGE, is an important tool in the field of computational fluid dynamics (CFD). It provides an efficient method to improve the accuracy of flow solutions while simultaneously reducing computer processing time. Briefly, SAGE enhances an initial computational grid by redistributing the mesh points into more appropriate locations. The movement of these points is driven by an equal-error-distribution algorithm that utilizes the relationship between high...
Topics: PLASMA INTERACTIONS, MAGNETOPAUSE, RESEARCH, BOUNDARIES, PARTICLE EMISSION, SOLAR WIND,...
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280
May 23, 2011
05/11
by
Tewari, Surendr
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Silicon-base ceramics are promising candidate materials for high temperature structural applications such as heat exchangers, gas turbines and advanced internal combustion engines. Composites based on these materials are leading candidates for combustor materials for HSCT gas turbine engines. These materials possess a combination of excellent physical and mechanical properties at high temperatures, for example, high strength, high toughness, high thermal shock resistance, high thermal...
Topics: MAGNETOPAUSE, MAGNETOHYDROSTATICS, AMPTE (SATELLITES), MAGNETIC FIELD CONFIGURATIONS, CROSSINGS,...
During the final year of this investigation we have finished several event studies that we considered necessary for the development of a tail magnetopause model and for the calibration of our simulation code. We have not reached the ultimate goal of the project, i.e., the development of an analytical tail magnetopause model. In the course of the investigation we have learned that such a model would be much more complex than we had anticipated. However, the investigations that we conducted...
Topics: NASA Technical Reports Server (NTRS), MAGNETOPAUSE, COMPUTERIZED SIMULATION, MODELS, MATHEMATICAL...
During the investigation we have finalized the event studies that are necessary for the development of the magnetopause model and for the calibration of our simulation code.
Topics: NASA Technical Reports Server (NTRS), MAGNETOPAUSE, COMPUTERIZED SIMULATION, MODELS, CALIBRATING,...
Investigations of cosmic ray anisotropies and their relationship to concurrent magnetic field data are reported. These investigations range in scope from the examination of data very late in the decay phase of a solar particle event where long term (approximately 6 hour) averages are used and definite interplanetary effects sought after to an examination of the change in low energy particle anisotropy as the satellite approaches the bow shock and the magnetopause.
Topics: NASA Technical Reports Server (NTRS), COSMIC RAYS, MAGNETIC FIELDS, BOW WAVES, GEOMAGNETISM,...
The concept of how magnetosheath plasma can cross the magnetopause is one of the key elements for a global view of the magnetosphere. According to this view, viscous interaction is the main process to produce convection of plasma in the magnetotail, resulting in auroral phenomena, and other related processes. The mechanism is illustrated herein. The key element is that the electric field is not constant, as assumed in reconnection theories, but reverse within the magnetopause current sheet....
Topics: NASA Technical Reports Server (NTRS), ELECTRIC FIELDS, IONS, MAGNETOPAUSE, PLASMAS (PHYSICS),...
Three dimensional measurements from the ISEE-1 low energy electron spectrometer are used to map the location of the inner edge of the plasma sheet and study the anisotropies in the electron distribution function associated with this boundary. Lower energy plasma sheet electrons have inner edges closer to the Earth than higher energies with the separations at different energies being larger near dawn and after dusk than at midnight. Lowest energy inner edges are frequently located adjacent to...
Topics: NASA Technical Reports Server (NTRS), ANISOTROPY, CURRENT SHEETS, ELECTRON DISTRIBUTION,...
Fluid signatures in the MHD approximation at rotational discontinuities (RD) of finite width called rotational shear layers (RSL) are examined for general flow and magnetic geometries. Analytical and geometrical arguments illustrate that the fluid speed can either go up or down across an RSL for a fixed normal mass flux. The speed profile may or may not be monotonic depending on the boundary conditions. The flow velocity may or may not be field aligned or ""jetting'' as a result of...
Topics: NASA Technical Reports Server (NTRS), DISCONTINUITY, FLUID MECHANICS, MAGNETOHYDRODYNAMICS,...
Magnetic field reconnection at the magnetopause and the energy balance are considered.
Topics: NASA Technical Reports Server (NTRS), INTERNATIONAL SUN EARTH EXPLORERS, MAGNETIC FIELD...
At a tangential discontinuity between two constant magnetic fields a layer of trapped particles can exist, this work examines the conditions under which the current carried by such particles tends to maintain the discontinuity. Three cases are examined. If the discontinuity separates aligned vacuum fields, the only requirement is that they be antiparallel. With arbitrary relative orientations, the field must have equal intensities on both sides. Finally, with a guiding center plasma on both...
Topics: NASA Technical Reports Server (NTRS), COSMIC PLASMA, DISCONTINUITY, MAGNETOPAUSE, TRAPPED...
Observations on magnetopause structure are reported. Major topics covered include: classical reconnection, transport mechanisms, magnetospheric boundary layers, tearing modes, and Jupiter's magnetopause.
Topics: NASA Technical Reports Server (NTRS), GEOMAGNETISM, GEOPHYSICAL OBSERVATORIES, MAGNETOPAUSE,...
Orbit plots for the Prognoz 4 satellite for the time period January to March 1976 are given. This satellite was identified as a possible important contributor to the International Magnetospheric Study project. The orbits were based on an element epoch of December 26, 1975, 3h 8min and 17s. In view of the low perigee of this satellite, the Satellite Situation Center (SSC) considered that the effect of atmospheric drag precludes orbit predictions for the length of time normally used by the SSC...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, GEOCENTRIC COORDINATES, ORBIT...
The earth's magnetopause is the boundary between a hot tenuous plasma in the magnetosphere and a cooler denser plasma in the magnetosheath. Both of these plasmas contain magnetic fields whose directions are usually different but whose magnitudes are often comparable. Efforts to understand the structure of the magnetosphere were hampered by the variability and complexity of this boundary. Although conclusive direct evidence for a field component, B sub n across the magnetopause was not found,...
Topics: NASA Technical Reports Server (NTRS), BOUNDARY LAYERS, ENERGY CONVERSION, MAGNETOPAUSE, TOPOLOGY,...
This Summary of Research is being submitted to NASA Goddard Space Flight Center in fulfillment of the final reporting requirement under Grant NAG5-7943, which terminated on March 31, 2002. The following contains a summary of the significant accomplishments of the Polar Plasma Wave Investigation (PWI) team during the period of the grant, April 1, 1999 through March 31, 2002, and a listing of all of the publications that resulted from work carried out under the grant. Also included below is a...
Topics: NASA Technical Reports Server (NTRS), PLASMA WAVES, TURBULENT BOUNDARY LAYER, WAVE PROPAGATION,...
Magnetic field data from the IMP 6 spacecraft are used in an attempt to clarify the magnetic field microstructure of the magnetopause. After discussing the problems in identifying the magnetopause, and the difficulties in determining normal components, the presence of waves in the vicinity of the magnetopause is discussed. The downstream magnetopause is considered and the presence of surface waves on the tail boundary is demonstrated.
Topics: NASA Technical Reports Server (NTRS), MAGNETIC FIELDS, MAGNETOPAUSE, PLASMA WAVES, GEOMAGNETIC...
A description of the orbital positions is provided for a number of high altitude satellites capable of making magnetospheric measurements in the first half of 1977 as part of the International Magnetospheric Study (IMS). Six artificial satellites -- Vela 5B, IMP-H, IMP-J, Solrad 11A, Solrad 11B, and Hawkeye 1 -- have been chosen along with the moon. The daily position summary of the satellites includes data tables which provide the crossing times of the bow shock and magnetopause, as well as...
Topics: NASA Technical Reports Server (NTRS), ARTIFICIAL SATELLITES, EARTH MAGNETOSPHERE, POSITION...
The validity is investigated of a suggested model according to which Pc 3 and/or Pc 4 micropulsations are excited by magnetosheath field (and plasma) fluctuations arising in the quasi-parallel structure of the subsolar bow shock. The influence of solar wind plasma parameters on local shock structure and on the configuration of the entire bow shock system is included. Simultaneous data from two or more spacecraft and from multiple diagnostics is used to evaluate the geometrical factor,...
Topics: NASA Technical Reports Server (NTRS), BOW WAVES, MAGNETOPAUSE, MAGNETOSHEATH, MICROPULSATIONS,...
The magnetic field of the magnetosheath is most naturally discussed in terms of its steady state and its fluctuating components. Theory of the steady state field is quite well developed and its essential features have been confirmed by observations. The interplanetary field is convected through the bow shock where its magnitude is increased and its direction changed by the minimal amount necessary to preserve the normal component across the shock. Convection within the magnetosheath usually...
Topics: NASA Technical Reports Server (NTRS), BOW WAVES, EARTH MAGNETOSPHERE, MAGNETIC FIELDS,...
Flux Transfer Events (FTEs) are magnetopause signatures that result from the passage of flux ropes produced by transient bursts of reconnection. They exhibit bipolar signatures in the component of the magnetic field normal to the magnetopause and transient increases or crater-like structures in the magnetic field strength. We use the bipolar magnetic field signatures and magnetic field strength variations observed by all four Cluster spacecrafts during the years of 2002 and 2003 to determine...
Topics: NASA Technical Reports Server (NTRS), FLUX TRANSFER EVENTS, MOTION, MAGNETOPAUSE, MAGNETIC...
Data from multiple ground stations and satellites were used to see how the plasmasphere in the dusk sector is modified during magnetic storms. There is clearly some type of erosion process, during which the plasmasphere is diminished in size, and it is believed that the excess plasma is peeled off and carried (convected) away toward the outer boundary of the magnetosphere (the magnetopause). However, very little is know about the physics of the erosion process, and about how the plasmasphere...
Topics: NASA Technical Reports Server (NTRS), BULGING, EARTH MAGNETOSPHERE, MAGNETIC STORMS, MAGNETOPAUSE,...
388
388
May 23, 2011
05/11
by
Long, David G.; Collyer, R. Scott; Reed, Ryan; Arnold, David V
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Measurements of the normalized radar cross section (sigma(sup o)) made by the YSCAT ultrawideband scatterometer during an extended deployment on the Canada Centre for Inland Waters(CCIW) Research Tower located at Lake Ontario are analyzed and compared with anemometer wind measurements to study the sensitivity of (sigma(sup o)) to the wind speed as a function of the Bragg wavelength. This paper concentrates on upwind and downwind azimuth angles in the wind speed range of 4.5-12 m/s. While YSCAT...
Topics: SOLAR ELECTRIC PROPULSION, TRANSFER ORBITS, RADIATION COUNTERS, NASA PROGRAMS, SPACE MISSIONS,...
We employ a global magnetohydrodynamic model to study the effects of the interplanetary magnetic field (IMF) strength and direction upon the cross-section of the magnetotail at lunar distances. The anisotropic pressure of draped magnetosheath magnetic field lines and the inclusion of a reconnection-generated standing slow mode wave fan bounded by a rotational discontinuity within the definition of the magnetotail result in cross-sections elongated in the direction parallel to the component of...
Topics: NASA Technical Reports Server (NTRS), MAGNETOHYDRODYNAMICS, INTERPLANETARY MAGNETIC FIELDS,...
This final report describes activities under NASA contract NAS5-31213 to Lockheed Missiles and Space Company. The report covers the entire contract period from 8 May 1991 to 7 Jun. 1994. This is a contract under the NASA Guest Investigator Program for the analysis and interpretation of the combined scientific data from the Hot Plasma Composition Experiment (HPCE) and the Charge Energy Mass (CHEM) spectrometer on the AMPTE/Charge Composition Explorer (CCE) spacecraft. These combined data sets...
Topics: NASA Technical Reports Server (NTRS), HIGH TEMPERATURE PLASMAS, IONS, MAGNETOPAUSE, MAGNETOSHEATH,...
In 1979-1981, the three USA spacecraft Pioneer 11 and Voyagers 1 and 2 discovered and explored the magnetosphere of Saturn to the limited extent possible on flyby trajectories. Considerable variation in the locations of the bow shock (BS) and magnetopause (MP) surfaces were observed in association with variable solar wind conditions and, during the Voyager 2 encounter, possible immersion in Jupiter's distant magnetic tail. The limited number of BS and MP crossings were concentrated near the...
Topics: NASA Technical Reports Server (NTRS), BOUNDARIES, PLANETARY MAGNETOSPHERES, SATURN (PLANET), BOW...
Severe space weather is characterized by intense particle radiation from the Sun and major geomagnetic storm caused by magnetized solar plasmas arriving at Earth. Coronal mass ejections (CMEs) are key players in both these aspects. CMEs traveling at super-Alfv nic speeds drive fast-mode MHD shocks that create the high levels of particle radiation. When a CME arrives at Earth, the CME-associated magnetic fields reconnect with Earth s magnetopause fields resulting in solar plasma entry into the...
Topics: NASA Technical Reports Server (NTRS), CORONAL MASS EJECTION, SOLAR CYCLES, SPACE WEATHER, ENERGETIC...
Bow shock and magnetopauses formation is discussed. Plasma and magnetic field environments of all the planets from Mercury to Saturn were measured. It was found that all the planets have bow shocks and almost all have a magnetopause. Venus is the only planet with no measurable intrinsic magnetic field and the solar wind interacts directly with Venus' ionosphere. The bow shock characteristics depend on the changing solar wind conditions. The shape of a magnetopause or any obstacle to flow...
Topics: NASA Technical Reports Server (NTRS), BOW WAVES, CONFERENCES, MAGNETIC FIELDS, MAGNETOPAUSE, SHOCK...
A novel method is described for reconstruction of two-dimensional current-layer structures from measurements taken by a single spacecraft traversing the layer. In its present form, the method is applicable only to 2D magnetohydrostatic structures that are passively convected past the observing spacecraft. It is tested on a magnetopause crossing of the tangential-discontinuity type by the spacecraft AMPTE/IRM. The magnetic structures recovered include a magnetic island located between two X-type...
Topics: NASA Technical Reports Server (NTRS), MAGNETOPAUSE, MAGNETOHYDROSTATICS, AMPTE (SATELLITES),...
Highlights of the design and fabrication of fluxgate magnetometers for the ISEE A and B satellites which were launched from a single launch vehicle into the same highly elliptical orbit are presented. The instrument consisted of four basic assemblies: the sensors, the drive and sense electronics, the data handling unit; and the flipper. The digital handling data handling assembly contained a digital filter that mantained a uniform transfer function for all three axes of both spacecraft. Initial...
Topics: NASA Technical Reports Server (NTRS), INTERNATIONAL SUN EARTH EXPLORERS, MAGNETOMETERS,...
We present a multipoint case study of solar wind and magnetospheric observations during a transient magnetospheric compression at 2319 UT on October 15, 2008. We use high-time resolution magnetic field and plasma data from the THEMIS and GOES-11/12 spacecraft to show that this transient event corresponded to an abrupt rotation in the IMF orientation, a change in the location of the foreshock, and transient outward bow shock motion. We employ results from a global hybrid code model to reconcile...
Topics: NASA Technical Reports Server (NTRS), SHOCK WAVES, BOW WAVES, SOLAR WIND, MAGNETIC FIELDS,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), MAGNETIC FIELD RECONNECTION, MAGNETOHYDRODYNAMICS, DATA...
In this report, we provide a summary of our most significant research accomplishments resulting from this contract. For the sake of brevity, most of the projects are explained in a paragraph length, highlighting only pertinent results.
Topics: NASA Technical Reports Server (NTRS), PLASMA INTERACTIONS, MAGNETOPAUSE, RESEARCH, BOUNDARIES,...
From the International Sun-Earth Explorers (ISEE) 1 magnetopause crossings on November 10, 1977, three-dimensional distribution functions for energetic ions were studied in the magnetosphere, through the magnetopause, and in the magnetosheath (Speiser and Williams, 1982). The particle distributions were particularly examined at and near the times that Russell and Elphic (1978) identified as flux transfer events (FTE). Using a simple, one-dimensional, quasi-static model, particle orbits were...
Topics: NASA Technical Reports Server (NTRS), CROSSINGS, DISTRIBUTION FUNCTIONS, FLUX TRANSFER EVENTS,...
The OGO-5 fluxgate magnetometer experiment (E-14) was designed to measure the vector magnetic field over the full range of the OGO-5 orbit. Thus, it had a dynamic range of + or - 64,000 gamma yet it maintained a precision of + or - 1/16 gamma at all times. This enabled a broad spectrum of problems to be attached. Studies of the magnetospheric waves, currents, waves-particle interactions, pitch angle distributions and wave normal directions were made. The structure of the magnetopause, the...
Topics: NASA Technical Reports Server (NTRS), MAGNETIC FIELDS, MAGNETOMETERS, OGO-5, SATELLITE ORBITS,...
The approximate magnitudes of several power inputs and energies associated with the Earth's magnetosphere will be derived. They include: Solar wind power impinging on the dayside magnetopause approximately 1.4 10 to the 13th power watt; power input to cross tail current approximately 3 10 to the 11th power watt; energy of moderate magnetic storm approximately 2 10 to the 15th power joule; power related to the flow of j approximately 1 to 3 10 to the 11th power watt; average power deposited by...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, ENERGY TRANSFER, MAGNETIC STORMS,...
It is shown how satellite magnetometer data at a magnetopause penetration can be used to determine the vector normal to the magnetopause current layer and the magnetic field component along this normal. Results from 22 Explorer 12 boundary penetrations indicate normal field components of less than 5 gamma in two-thirds of the cases. Measured field variations within the current layer demonstrate the existence of two fundamentally different types of boundary structure, the rotational and the...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, EXPLORER 12 SATELLITE, MAGNETOPAUSE,...
The understanding of neutron star physics which relies heavily on knowing values of their mass, radius and magnetic field strength was studied. The only information about these till now comes from the surface radiation. Major uncertainties concerning the nature of the mass exchange and the accretion flow, the magnetopause structure, the infall deceleration, the actual pulsation mechanism and the atmosphere geometry are examined. The alternatives and several possible observational tests are...
Topics: NASA Technical Reports Server (NTRS), ASTROPHYSICS, LIGHT EMISSION, PULSARS, RADIO SOURCES...
We present a case study of a large deformation of the magnetopause on November 26, 2008. The investigation is based on observations of five THEMIS spacecraft located at the dawn flank in the magnetosphere and magnetosheath, on Cluster measurements at the dusk magnetosheath, and is supported by ACE solar wind monitoring. The main revelation of our study is that the interaction of the IMF discontinuity with the bow shock creates either one very elongated hot flow anomaly (HFA) or a pair of them...
Topics: NASA Technical Reports Server (NTRS), MAGNETOPAUSE, MAGNETOSHEATH, DEFORMATION, SOLAR WIND,...
We employ the Cooling et al. [2001] model to predict the location, orientation, and motion of flux transfer events (FTEs) generated along finite length component and anti parallel reconnection lines for typical solar wind plasma conditions and various interplanetary magnetic field (IMF) orientations in the plane perpendicular to the SunEarth line at the solstices and equinoxes. For duskward and northward or southward IMF orientations, events formed by component reconnection originate along...
Topics: NASA Technical Reports Server (NTRS), FLUX TRANSFER EVENTS, INTERPLANETARY MAGNETIC FIELDS, WIND...
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227
May 23, 2011
05/11
by
Bansal, Narottam P
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Unidirectional CVD SiC(f)(SCS-6) fiber-reinforced strontium aluminosilicate (SAS) glass-ceramic matrix composites containing various volume fractions, approximately 16 to 40 volume , of fibers were fabricated by hot pressing at 1400 C for 2 h under 27.6 MPa. Monoclinic celsian, SrAl2Si2O8, was the only crystalline phase formed, with complete absence of the undesired hexacelsian phase, in the matrix. Room temperature mechanical properties were measured in 3-point flexure. The matrix...
Topics: GEOMAGNETIC TAIL, KINETIC ENERGY, PLASMA HEATING, PLASMA LAYERS, SOLAR TERRESTRIAL INTERACTIONS,...
A summary discussion of recent sodium and potassium observations for the atmospheres of the Moon and Mercury is presented with primary emphasis on new full-disk images that have become available for sodium. For the sodium atmosphere, image observations for both the Moon and Mercury are fitted with model calculations (1) that have the same source speed distribution, one recently measured for electron-stimulated desorption and thought to apply equally well to photon-stimulated desorption, (2)...
Topics: NASA Technical Reports Server (NTRS), MERCURY (PLANET), MOON, POTASSIUM, SODIUM, MERCURY...
We present an analytical model for the magnetic field perturbations associated with flux transfer events (FTEs) on the dayside magnetopause as a function of the shear between the magnetosheath and magnetospheric magnetic fields and the ratio of their strengths. We assume that the events are produced by component reconnection along subsolar reconnection lines with tilts that depend upon the orientation of the interplanetary magnetic field (IMF), and show that the amplitudes of the perturbations...
Topics: NASA Technical Reports Server (NTRS), FLUX TRANSFER EVENTS, INTERPLANETARY MAGNETIC FIELDS,...
During August 1972, Explorer 45 orbiting near the equatorial plane with an apogee of about 5.2 R sub e traversed magnetic field lines in close proximity to those simultaneously traversed by the topside ionospheric satellite ISIS 2 near dusk in the L range 2-5.4. The locations of the Explorer 45 plasmapause crossings during this month were compared to the latitudinal decreases of the H(+) density observed on ISIS 2 near the same magnetic field lines. The equatorially determined plasmapause field...
Topics: NASA Technical Reports Server (NTRS), IONOSPHERICS, MAGNETOPAUSE, PLASMAPAUSE, EQUATORS, HYDROGEN...
This report describes the work done by SciberNet, Inc. during the month of August. We have resolved the issues associated with the implementation of the dipole field in our large scale hybrid simulations of the magnetopause. We have setup several runs and will spend the next several months analyzing the data. The results will be presented at the Fall AGU. We are also continuing our analysis of the 3-D simulations of thin current sheets at the magnetopause, paying special attention to the...
Topics: NASA Technical Reports Server (NTRS), BOUNDARY CONDITIONS, MAGNETOTAILS, SIMULATION, PLASMA...
The approximate magnitudes of power inputs and energies associated with the Earth's magnetosphere were derived. The nearest 40 R sub E of the plasma sheet current receive some 3.10 to the 11th power watt, and much of this goes to the Birkeland currents, which require 1-3 10 to the 11th power watt. Of that energy, about 30% appears as the energy of auroral particles and most of the rest as ionosphere joule heating. The ring current contains about 10 to the 15th power joule at quiet times,...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, ENERGY TRANSFER, MAGNETIC STORMS,...
The aurora has come to be understood as a manifestation of energy transfer and plasma transfer from the solar wind to the magnetosphere. The auroral oval seems to be a mapping of the boundary layer that lies just inside the magnetospheric surface, which consists of the magnetopause and neutral sheet. The auroral oval is consequently a region of reversal for the meridional (r,8) component of the magnetospheric convection electric field and thus a region of strong shear in the plasma drift...
Topics: NASA Technical Reports Server (NTRS), AURORAL ZONES, BOUNDARY LAYER PLASMAS, EARTH MAGNETOSPHERE,...
