Physics – Plasma Physics
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4155g&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 22, p. 4155-4158
Physics
Plasma Physics
41
Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Solar Wind Plasma, Space Plasma Physics: Charged Particle Motion And Acceleration
Scientific paper
Strong depletions in solar wind electron halo distribution functions, centered on and roughly symmetric about 90° pitch angle, are present in at least 10% of data obtained by the Los Alamos SWEPAM experiment on the ACE spacecraft. Sunward-directed conics are also present in the electron data, occur in conjunction with the 90° depletions, but are less common than depletions. We suggest that on open field lines both depletions and conics arise from focusing and mirroring effects associated with field line connection to magnetic field enhancements farther out in the heliosphere. The focusing and mirroring produces field-aligned, counterstreaming fluxes of suprathermal electrons somewhat similar to that observed on closed field lines. Our observations provide strong evidence that the antisunward-directed portion of the electron halo on open field lines at times results primarily from mirroring of back scattered strahl and/or shock-heated electrons from far out in the heliosphere.
Feldman William C.
Gosling Jack T.
Skoug Ruth M.
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