Properties of high-energy electrons at dawnside magnetosheath: Cassini observations during the earth swing-by 1999

Details Properties of high-energy electrons at dawnside magnetosheath: Cassini observations during the earth swing-by 1999 Properties of high-energy electrons at dawnside magnetosheath: Cassini observations during the earth swing-by 1999

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51a1624o&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51A-1624

Mathematics

Probability

2728 Magnetosheath

Scientific paper

We report on the energetic electrons of the magnetospheric origin at the night side magnetosheath using the Low-Energy Magnetospheric Measurement System (LEMMS) aboard the Cassini spacecraft during the Earth swing-by maneuver on 17 August 1999. LEMMS is able to identify the energy and incidence direction of energetic ions and electrons with energies of a few tens of keV to several tens of MeV. The spacecraft was traveling with a velocity of 9 Earth radii (RE) per hour and made rapid transversals of the terrestrial magnetosphere. The spacecraft was outbound over the dawn magnetopause at approximately 10:50 UT at the last time, investigating through the magnetosheath afterward. LEMMS identified 6 electron bursts ranging at least up to 100 keV from X = -70 to -95 RE. These electron streams were away from the general magnetopause position along the magnetic field line. Those features were consistent with former works on the energetic particles in the magnetosheath [e.g. Sarafopoulos et al., 1999]. In this study, taking advantage of the uniqueness of the position in the distant dawnside magnetosheath and the fast snapshot during the swing-by, we discuss the source of these electrons and probability of the event compared to the ion bursts.

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