Magnetosheath plasma precipitation in the polar cusp and its control by the interplanetary magnetic field

Details Magnetosheath plasma precipitation in the polar cusp and its control by the interplanetary magnetic field Magnetosheath plasma precipitation in the polar cusp and its control by the interplanetary magnetic field

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.1421w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Feb. 1, 1992, p. 1421-1430. Research supported by Swedish Board of Sp

Physics

109

Interplanetary Magnetic Fields, Magnetosheath, Particle Precipitation, Plasma Diffusion, Polar Caps, Magnetoplasmadynamics, Polar Orbits, Satellite Observation

Scientific paper

Viking hot plasma data obtained on meridional cusp crossings are used to investigate magnetosheath particle precipitation in the polar cusp region. Two distinctively different regions are commonly encountered on a typical pass. One region is characterized by high-density particle precipitation, with an ion population characterized by a convecting Maxwellian distribution. Typical magnetosheath parameters are inferred for the spectrum of the source population. The spectral shape of the ion population encountered in the second region suggests that here the magnetosheath ions have been energized by about 1 keV, corresponding to an ion velocity gain of about twice the magnetosheath Alfven velocity. The location of the region containing the accelerated plasma is dependent on the IMF Bz component. The observations are interpreted as evidence for plasma acceleration due to magnetopause current sheet disruptions/merging of magnetospheric and interplanetary magnetic flux tubes.

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