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  • 1970-1974  (10)
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Year
  • 1
    Call number: M 17.90713
    Type of Medium: Monograph available for loan
    Pages: VI, 205 S. , Ill.
    ISBN: 9789401031288 , 9789027702111 (print)
    Classification:
    Geomagnetism, Geoelectromagnetism
    Language: English
    Note: Composition and Dynamics of the Solar Wind PlasmaThe Configuration of the Interplanetary Magnetic Field -- Scattering and Scintillations of Discrete Radio Sources as a Measure of the Interplanetary Plasma Irregularities -- Galactic Cosmic Ray Modulation by the Interplanetary Medium (Including the Problem of the Outer Boundary) -- Low-Energy Cosmic Rays in Interplanetary Space -- Energetic Solar Particles in the Interplanetary Medium -- Discontinuities and Shock Waves in the Interplanetary Medium and Their Interaction with the Magnetosphere -- Interaction of the Solar Wind with the Moon..
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  • 2
    Publication Date: 1972-04-01
    Print ISSN: 0031-9228
    Electronic ISSN: 1945-0699
    Topics: Physics
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  • 3
    Publication Date: 2011-08-16
    Description: A computer code has been developed to study quantitatively the drift motion of magnetospheric particles in a time-dependent electric field. These calculations were applied to the case of proton and electron injections from the plasma sheet during substorms; the model predictions were checked against observations on board the geosynchronous satellite ATS 5 by DeForest and McIlwain (1971). It was found that it is possible to simulate the observed proton spectrograms with an adequate choice of a time-dependent electric field model. The resulting kinematics is physically quite simple and in its gross features does not depend too strongly on the particular fine structure of the model.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 79; Apr. 1
    Format: text
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  • 4
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    In:  Other Sources
    Publication Date: 2011-08-16
    Description: A qualitative description of the general magnetospheric configuration is given, with emphasis on some of the physical processes governing the magnetosphere that are the main targets of current research. The magnetosphere behaves like a huge 'bag' of plasma and radiation that swells and contracts under the influence of the solar wind. The electric field, the magnetospheric plasma, the magnetospheric substorm, and the radiation belt and wave particle interactions are discussed. During the past 15 years, the study of the earth's magnetosphere man's immediate plasma and radiation environment - has undergone a successful stage of discovery and exploration. Investigators have obtained a morphological description of the magnetospheric field, the particle population embedded in it, and its interface with the solar wind, and have identified and are beginning to understand many of the physical processes involved. Quite generally, the magnetosphere reveals itself as a region where it is possible to observe some of the fundamental plasma processes at work that are known to occur elsewhere in the universe.
    Keywords: GEOPHYSICS
    Type: Science; 183; Jan. 11
    Format: text
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  • 5
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    Publication Date: 2011-08-16
    Description: The barium cloud injection deep into the magnetosphere of Sept. 21, 1971, has revealed that the quiet-time near-equatorial nightside magnetic field is significantly different from that predicted by existing quite-time models. The influence of currents flowing on or near the geomagnetic equator gives the field a more tail-like structure at a distance as close as 5 earth radii. Several models have been tried out to obtain a best fit to the experimental observations of the shape of the field-aligned ion cloud. Although this method does not lead to a unique solution, the most acceptable option emerging from this analysis is a quiet-time tilted image-dipole model with a Williams-Mead tail field and a disclike ring current on the geomagnetic equator.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 78; Sept. 1
    Format: text
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  • 6
    Publication Date: 2011-08-16
    Description: One of the quadrupole terms in the main geomagnetic field is found to contribute to a north-south 'shear distortion' of the particle-drift shells, whereas one of the octupole components causes a longitude-dependent radial deformation and associated 'drift-shell splitting.' The collective action of all higher multipoles on trapped-particle motion is then used to analyze the 'true' anomalies or distortions of the internal geomagnetic field that are independent of the quadrupole-related eccentricity of the main dipole. These 'true' anomalies must originate in upper-mantle or crustal perturbations that lie relatively near the earth's surface on both sides of the mid-Atlantic ridge; they influence trapped-particle drift shells only where the latter have their closest approach to the earth (South Atlantic and South African areas). The quadrupole and octupole perturbations, on the other hand, obviously originate deep in the earth's core. In the final part of this review, we discuss the effects of external magnetospheric currents. A time-dependent symmetric ring current causes drift shells to be displaced radially, with associated particle acceleration; magnetopause currents introduce a day-night asymmetry, causing shell splitting.
    Keywords: GEOPHYSICS
    Type: Reviews of Geophysics and Space Physics; 10; May 1972
    Format: text
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  • 7
    Publication Date: 2011-08-16
    Description: Some features of the secular variation of the geomagnetic field are examined. Contours encircling constant magnetic flux (third adiabatic invariant), corresponding to a shell of field lines in secular motion, reveal a general westward drift that is longitude and latitude dependent (with minima in the north Pacific and south Atlantic areas). Some invariant relationships appear among the field coefficients in the tilted, centered dipole (geomagnetic) coordinate system.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 1; Dec. 197
    Format: text
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  • 8
    Publication Date: 2019-06-27
    Description: Computations on an 80-coefficient model of the earth's field illustrate the 'topography' of the magnetic equatorial surface and the geometry of the drift shells of geomagnetically trapped particles. Individual terms in the spherical harmonic expansion of the geomagnetic scalar potential V(r, theta, phi) are either even or odd in cos theta, where theta = 90 deg denotes the dipole equator. Terms that are even in cos theta tend to 'warp' the equatorial surface, but do not (in first order) distort particle drift shells radially nor split the drift shells of particles having different equatorial pitch angles. Azimuthally asymmetric terms that are odd in cos theta do cause shell splitting in first order. Shell splitting at large L values (neglecting deformation of the earth's field by the solar wind) is found to be dominated by the geomagnetic octupole. At L approximately equal to 1, shell splitting is strongly enhanced by the South American and South African anomalies. When combined with pitch angle diffusion caused by atmospheric scattering, these results may be able to account for anomalous radial diffusion of inner zone electrons.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 78; Jan. 1
    Format: text
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  • 9
    Publication Date: 2019-06-27
    Description: Magnetospheric electric field configuration from trapped particle flux asymmetries, using Explorer 14 electron data
    Keywords: SPACE RADIATION
    Type: ; ADEMIE DES SCIENCES
    Format: text
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  • 10
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    Publication Date: 2019-07-13
    Description: The capability of the Space Shuttle for the conduct of magnetospheric experiments is critically analyzed. Some physical problems are discussed on which a particle and field payload program could be based. They include the study of magnetospheric plasma processes, wave-particle interactions and auroral phenomena, both by artificial modification experiments and by systematic wide-scale observations of naturally occurring magnetospheric perturbation events.
    Keywords: SPACE SCIENCES
    Type: Symposium on Space Shuttle Payloads; Dec 27, 1972 - Dec 08, 1972; Washington, DC
    Format: text
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