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  • 1
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    Solar wind-magnetosphere coupling; Proceedings of the Chapman Conference, California Institute of Technology, Pasadena, Feb. 12-15, 1985 (1986)
    In:  Other Sources
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    Publication Date: 2016-03-09
    Description: Various papers on the coupling of the solar wind with the earth's magnetosphere are presented. The topics addressed include: geomagnetic indices and statistical methods; solar wind and magnetospheric processes, including solar wind control of the magnetosphere, dayside interaction, and solar wind disturbances and magnetospheric response; the electrodynamics of magnetosphere-ionosphere coupling, including electric fields and currents and auroras and auroral precipitation; and solar wind control of the nightside magnetosphere.
    Keywords: GEOPHYSICS
    Format: text
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  • 2
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    Equatorial bubbles updrafting at supersonic speeds (1992)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Plasma and electric field observations from two satellite encounters with equatorial plasma bubbles updrafting at velocities of about 2 km/s are presented. These large, upward velocities are consistent with an adaptation of Chandrasekhar's model for the motion of plasma blobs supported against gravity by a magnetic field. Vector magnetic field measurements, available during one of the bubble encounters show a perturbation of about 150 nT, directed radially outward from the earth, near the western wall of deepest plasma depletion. This magnetic variation is too large to be caused by simple shunting of the g x B current along the bubble's edge. Rather, it is Alfvenic in nature, radiating from a generator located near the magnetic equator, in the plasma outside the bubble's leading edge. A heuristic model of a depleted flux tube with constant circular cross section moving upward through a background plasma predicts most of the measurements' qualitative features.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; A6 J
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  • 3
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    Polar cap potential distributions during periods of positive IMF B(sub y) and B(sub z) (1994)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: We compare the DE-2 electric field measurements used by HEPPNER and MAYNARD (1987) to illustrate strongly distorted, BC convection patterns for interplanetary magnetic field (IMF) B(sub z) greater than 0 and large absolute value of B(sub y), with simultaneous detections of particle spectra, plasma drifts and magnetic perturbations. Measured potentials greater than 50 keV, driven by the solar wind speeds exceeding 500 km/s, are greater than published correlation analysis predictions by up to 27%. The potential distributions show only two extrema and thus support the basic conclusion that under these conditions the solar wind/IMF drives two-rather than four-cell convection patterns. However, several aspects of the distorted two-cell convection pattern must be revised. In addition to the strong east-west convection in the vicinity of the cusp, indicated by Heppner and Maynard, we also detect comparable components of sunward (equatorward) plasma flow. Combined equipotential and particle precipitation distributions indicate the presence of a lobe cell embedded within the larger, afternoon reconnection cell. Both types rotate in the same sense, with the lobe cell carrying 20-40% of the total afternoon cell potential. We detected no lobe cell within morning convection cell.
    Keywords: GEOPHYSICS
    Type: Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169); 56; 2; p. 209-221
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  • 4
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    Mercury's Surface Magnetic Field Determined from Proton-Reflection Magnetometry (2014)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: Solar wind protons observed by the MESSENGER spacecraft in orbit about Mercury exhibit signatures of precipitation loss to Mercury's surface. We apply proton-reflection magnetometry to sense Mercury's surface magnetic field intensity in the planet's northern and southern hemispheres. The results are consistent with a dipole field offset to the north and show that the technique may be used to resolve regional-scale fields at the surface. The proton loss cones indicate persistent ion precipitation to the surface in the northern magnetospheric cusp region and in the southern hemisphere at low nightside latitudes. The latter observation implies that most of the surface in Mercury's southern hemisphere is continuously bombarded by plasma, in contrast with the premise that the global magnetic field largely protects the planetary surface from the solar wind.
    Keywords: Solar Physics; Lunar and Planetary Science and Exploration; Plasma Physics
    Type: GSFC-E-DAA-TN22244 , Geophysical Research Letters; 41; 13; 4463-4470
    Format: application/pdf
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