Tailward energetic ion streams observed at approximately 100 R(sub E) by GEOTAIL-EPIC associated with geomagnetic activity intensification

Details Tailward energetic ion streams observed at approximately 100 R(sub E) by GEOTAIL-EPIC associated with geomagnetic activity intensification Tailward energetic ion streams observed at approximately 100 R(sub E) by GEOTAIL-EPIC associated with geomagnetic activity intensification

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.3015j&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 3015-3018

Physics

5

Electrojets, Geomagnetic Tail, Ion Beams, Ionospheric Drift, Magnetic Storms, Planetary Magnetic Fields, Satellite Observation, Solar Wind, Space Plasmas, Angular Distribution, Geophysical Satellites, Geosynchronous Orbits, Magnetic Flux, Magnetic Measurement, Satellite-Borne Instruments, Spectrograms

Scientific paper

We report energetic particle (EPIC instrument) and magnetic field (MGF instrument) measurements collected onboard GEOTAIL located at approximately 100 R(sub E) downstream in the magnetotail during a 13-hour long active period on January 20-21, 1993. During this period, a series of 6 geomagnetic activity intensifications (breakup or pseudo-breakup) have been studied with ground magnetograms and energetic particle data at geosynchronous orbit. We show that: (1) as a general trend, the level of the energetic ion fluxes was related to the intensity of the westward electrojet; (2) a systematic temporal (within a few minutes) correlation exists between energetic ion flux enhancements observed by GEOTAIL/EPIC in the distant tail and near-Earth geomagnetic activity intensification onsets; and (3) for 5 of 6 cases, these energetic ion flux enhancements corresponded to strong tailward streams which included particles of both solar wind and ionospheric origin. Their amplitude seemed also to be related to the electrojet intensity change.

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