Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh31a1157h&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH31A-1157
Physics
2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 2116 Energetic Particles, Planetary
Scientific paper
The Ulsses Energetic PArticles Composition instrument (EPAC) consists out of four detector heads and was designed to provide information on the flux, directional three-dimensional anisotropy as well as chemical composition of energetic particles in interplanetary space. Ions and electrons can be measured separately. During the mission it became evident that important informations about a few hundred keV electrons can be extracted from the four EPAC telescopes. The COSPIN/KET experiment on board Ulysses has been monitoring the flux of 3-20 MeV electrons in interplanetary space since the launch in October 1990. Between 1 and 10 AU Jovian, and galactic particles contribute continously to the few-MeV electron intensities. During it's recent descend to low latitudes the Ulysses spacecraft approached the planet Jupiter within 1~AU. However, in addition to the average intensity level well accounted for by diffusion, we report about very short duration electron events, which are called Jovian electron jets, characterized by: (i) a sharp increase and decrease of flux: (ii) a spectrum identical to the
electron spectrum in the Jovian magnetosphere; and iii) a trong anisotropy. We compare our results with similar events, observed during the Jupiter flyby of Ulysses in 1992.
Blake B.
Heber Bernd
Krupp Norbert
Kunow Horst
Rodriguez Lino
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