Propagation of jovian electrons in and out of the ecliptic

Details Propagation of jovian electrons in and out of the ecliptic Propagation of jovian electrons in and out of the ecliptic

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..107f&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 6, p. 107-110.

Physics

15

Convection-Diffusion Equation, Electron Flux Density, Interplanetary Medium, Jupiter Atmosphere, Ulysses Mission, Electron Diffusion, Particle Telescopes

Scientific paper

Since its switch-on in Oct. 90, the Kiel Electron Telescope onboard Ulysses has detected many quiet time increases of the flux of 3-30 MeV electrons, known to originate from Jupiter. We report on the long term variations of this flux for the Ulysses ecliptic journey, and at the beginning of the out of ecliptic phase. They are well accounted for by a simple convection-diffusion model, with diffusion coefficients along and perpendicular to the magnetic field of about 5 x 10 exp 22 and 8 x 10 exp 20 sq cm/s respectively. In addition to the long term flux variations, several short bursts of electrons were detected, particularly after the Jupiter fly-by at southern latitudes. Their duration is about 1 hour or less, and they show a very strong anisotropy in the general direction of Jupiter. They are more numerous and are found at larger distances after encounter than before.

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