Magnetic pulsations from 0.1 to 4.0 Hz and associated plasma properties in the earth's subsolar magnetosheath and plasma depletion layer

Details Magnetic pulsations from 0.1 to 4.0 Hz and associated plasma properties in the earth's subsolar magnetosheath and plasma depletion layer Magnetic pulsations from 0.1 to 4.0 Hz and associated plasma properties in the earth's subsolar magnetosheath and plasma depletion layer

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1461a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1461-1479.

Physics

112

Geomagnetic Pulsations, Magnetosheath, Plasma Density, Solar Terrestrial Interactions, Space Plasmas, Earth Magnetosphere, Ion Cyclotron Radiation

Scientific paper

AMPTE CCE magnetic field data acquired during periods of magnetospheric compressions when the spacecraft sampled the magnetosheath are analyzed on the basis of a dynamic spectral analysis covering frequencies 0.1 to 4.0 Hz. Ion and electron data are used to identify regions, to monitor the upstream shock geometry, and to evaluate moments of the proton distribution. Fourteen encounters representing 46 hr of observations are analyzed. A compilation of the temporal sequence of spectral structures shows that electromagnetic ion cyclotron (EMIC) waves occur next to the magnetopause, while mirror waves occur outside the region of EMIC waves. It is concluded that there is a close relationship between EMIC waves in the sheath and the plasma depletion layer. For quasi-parallel upstream conditions, the magnetic field power spectra often exhibit no band limited structures but only broadband noise.

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