Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.0611w&link_type=abstract
American Astronomical Society, SPD meeting #34, #06.11; Bulletin of the American Astronomical Society, Vol. 35, p.819
Astronomy and Astrophysics
Astronomy
Scientific paper
Three periods of extremely low density solar wind (n < 1 cm-3) were detected by the WIND 3D plasma and Energetic Particle (3DP) instrument on successive solar rotations, July 4, July 31 and Aug 28,1999. The measurements show that the halo electron pitch angle distributions were far narrower than those in normal solar wind. With the increasing distance from the Sun, adiabactic focusing narrows the pitch angle distribution, while Coulomb collisions, which are proportional to the electron number density, widens the pitch angle distribution.In the low density events, fewer Coulomb collisions lead to a more anisotropic halo electron distribution. The observations are compared to numerical results from a 1-dimensional simulation based on the Fokker-Planck equation. We also examine solar observations from SOHO and YOHKOH to search for the source of the low density solar wind.
Hudson Hugh S.
Larson Davin E.
Lin Robert P.
Wang Li-Hong
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