Symmetric Suprathermal Electron Depletions in the Solar Wind

Details Symmetric Suprathermal Electron Depletions in the Solar Wind Symmetric Suprathermal Electron Depletions in the Solar Wind

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh12b0764g&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH12B-0764

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2114 Energetic Particles, Heliospheric (7514), 2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma, 7807 Charged Particle Motion And Acceleration

Scientific paper

Strong, order of magnitude, depletions in suprathermal electron distribution functions, centered on and roughly symmetric about 90 deg pitch angle, are common in the Los Alamos ACE SWEPAM solar wind data. These depletions persist for hours at a time and occur on both open and closed field lines. At times sunward-directed conics occur in conjunction with the 90 deg depletions. We suggest that both the depletions and the conics are the result of focusing and mirroring effects associated with local minimums in magnetic field strength. For open field lines the minimums arise because of magnetic connection to compression regions farther out in the heliosphere, whereas for closed field lines the minimums may arise simply from double magnetic connection to the Sun. On open field lines the focusing and mirroring produces field-aligned, counterstreaming fluxes of suprathermal electrons somewhat similar to, although intrinsically different from, that resulting from double magnetic connection to the hot corona. Our observations provide strong evidence that the antisunward-directed portion of the electron halo on open field lines at times results primarily from mirroring inside 1 AU of backstreaming suprathermal electrons from far out in the heliosphere rather than from scattering out of the strahl inside 1 AU.

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