Physics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..249t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 1, 1985, p. 249-260.
Physics
7
Anisotropy, Bow Waves, Earth Atmosphere, Ionic Diffusion, Shock Waves, Solar Wind, Energy Spectra, Protons, Space Density
Scientific paper
A detailed study was performed of the temporal development of field-aligned anisotropies and density gradient anisotropies during several diffuse ion events observed upstream of the earth's bow shock. A clear anticorrelation between the field-aligned anisotropy and the particle intensity is found; in the solar wind frame this anisotropy, which is directed away from the bow shock, decreases as the particle flux increases. Furthermore, the field-aligned anisotropy increases with increasing particle energy. In the strong scattering limit the one-dimensional diffusion-convection formalism predicts a decrease of the anisotropy with increasing energy. It is concluded that upstream escape is significant for higher energy particles and leads to the deviation from the prediction of the diffusion-convection formalism. Quantitatively, the diffusion-convection formalism predicts a field-aligned anisotropy which is larger than measured for the lowest energy particles (about 30 keV/e).
Ipavich Fred M.
Scholer Manfred
Terasawa Toshio
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