Counterstreaming suprathermal electron events upstream of corotating shocks in the solar wind beyond approximately 2 AU: ULYSSES

Details Counterstreaming suprathermal electron events upstream of corotating shocks in the solar wind beyond approximately 2 AU: ULYSSES Counterstreaming suprathermal electron events upstream of corotating shocks in the solar wind beyond approximately 2 AU: ULYSSES

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2335g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 21, p. 2335-2338

Physics

47

Corotation, Heat Flux, Hot Electrons, Interplanetary Magnetic Fields, Shock Waves, Solar Wind Velocity, Electron Energy, Energy Spectra, Magnetic Moments, Shock Heating, Ulysses Mission, Wave Propagation

Scientific paper

Enhanced fluxes of suprathermal electrons are commonly observed upstream of corotating forward and reverse shocks in the solar wind at heliocentric distances beyond approximately 2 AU by the Los Alamos plasma experiment on Ulysses. The average duration of these events, which are most intense immediately upstream from the shocks and which fade with increasing distance from them, is approximately 2.4 days near 5 AU. These events are caused by the leakage of shock-heated electrons into the upstream region. The upstream regions of these shocks face back toward the Sun along the interplanetary magnetic field, so these leaked electrons commonly counterstream relative to the normal solar wind electron heat flux. The observations suggest that conservation of magnetic moment and scattering typically limit the sunward propagation of these electrons as beams to field-aligned distances of approximately 15 AU. Although it seems unlikely that these shock-associated events are an important source of counterstreaming events near 1 AU, remnants of the backstreaming beams may contribute importantly to the diffuse solar wind halo electron population there.

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