Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21e..07n&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM21E-07
Other
7807 Charged Particle Motion And Acceleration, 7845 Particle Acceleration
Scientific paper
Pitch angle distributions of relativistic electrons in the jovian magnetosphere change sharply between pancake and bistreaming at 10 - 17 RJ that corresponds to the inner edge of the current sheet. To interpret this feature discovered by Pioneer 10 we have proposed a recirculation model of trapped particles, but more extensive observations by Galileo suggest another interpretation. (1) Energetic electrons are produced in this region. A potential mechanism is the acceleration by the whistler chorus in the same way as they produce killer electrons in the Earth's radiation belt. The electrons accelerated in this manner are known to have a relatively flat pitch angle distribution. Another potential source is the auroral electrons accelerated by the field- aligned electric field if this electric field is bursty. (2) Part of them diffuse inward and assume the pancake pitch angle distribution. (3) Among the other part that diffuse outward, those having large pitch angles take Speiser-orbit when they cross the neutral sheet, and this carries the electrons inward due to spiral configuration of the magnetic field. A void is produced for such high pitch angle electrons and the bistreaming anisotropy results, since the inward motion acts against the outward diffusion from the source region. Note that the void is not produced for ions whose Speiser-orbit carries them outward in the same direction as diffusion. (4) It remains to understand how the bistreaming anisotropy can be maintained against scattering.
Nishida Akira
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