Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21a1582l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH21A-1582
Other
2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma, 2169 Solar Wind Sources, 7807 Charged Particle Motion And Acceleration, 7859 Transport Processes
Scientific paper
Past studies have found that electron halo depletion at 90° pitch angle are observed in the solar wind about 10% of time. In the present study, we use STEREO multi-spacecraft data to statistically investigate (1) how this occurrence rate depends on the criteria used to define the depletions, (2) whether there is a relation between the local magnetic field strength and the magnitude of the halo depletion, (3) whether the magnitude of the magnetic field and halo depletion correlate between the two STEREO spacecraft, i.e., using appropriate lag time corrections, does a substantial halo depletion at one spacecraft correspond to a larger magnetic field at the other spacecraft if no depletion is observed there?, and (4) how these correlations evolve with inter-spacecraft separation. The results all tend to agree with the previous interpretation, based on single spacecraft event studies, that those 90° pitch angle electron halo depletions are the result of focusing and mirroring along magnetic field lines when magnetic field enhancements are present along the field line ahead and behind the observation point.
Fedorov Arkady
Galvin Antoinette
Génot Vincent
Gosling Jack T.
Jacquey Christian
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