Computer Science
Scientific paper
Nov 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21.1863a&link_type=abstract
Planetary and Space Science, Volume 21, Issue 11, p. 1863-1874.
Computer Science
Scientific paper
The pitch-angle distributions in and near the loss cone, of ~ (100-200) and ~ (200-350) keV protons observed by the ESRO IB satellite during the period 7-15 October 1969 are presented. The data include periods of relative quiet as well as more disturbed geomagnetic conditions. Spatial characteristics and dynamics of the protons, both on the night-and dayside of the Earth are described. The actual pitch-angle distribution is interpreted as produced by wave-particle interactions, and the diffusion coefficient and lifetime against pitch angle scattering have been estimated from existing theories. During slightly disturbed conditions, the observations suggest an average random walk in pitch angle made by a particle during a crossing of the diffusion region of about one half of the loss cone half angle for 4 <= L <= 6. The lifetime against pitch angle scattering into the loss cone is found to be somewhat less than the charge exchange lifetime for these (100-350) keV protons. The spectral density of interacting waves is tentatively estimated to about 0.1 γ2/Hz, and compares with estimates arrived at from completely different approaches.
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