Acceleration and Transport of Diffuse Protons in the foreshock region of the Earth's Bow Shock

Details Acceleration and Transport of Diffuse Protons in the foreshock region of the Earth's Bow Shock Acceleration and Transport of Diffuse Protons in the foreshock region of the Earth's Bow Shock

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh32d..07t&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH32D-07

Physics

2116 Energetic Particles, Planetary, 2149 Mhd Waves And Turbulence, 2154 Planetary Bow Shocks, 7851 Shock Waves, 7867 Wave/Particle Interactions

Scientific paper

We study the physical characteristics of diffuse protons in the region upstream of the earth's bow shock using the GEOTAIL data set of June-October 1994 which covers not only the nominal nose region (X>0) but also both the pre-dawn (X<0, Y>-70Re) and the post-dusk (X<0, Y<+60 Re) regions. (Note that the diffuse protons are observed in the post-dusk foreshock region when the IMF is in the 'anti-Parker' spiral direction.) What we have found are: (1) The diffuse protons in the pre-dawn and post-dusk regions have lower intensities and softer energy spectra than in the nose foreshock region. The exponential functional form of their energy spectra, exp(-E/Ec), which have been known from the earlier observations in the nose region, continue to the pre-dawn and post-dusk regions with reducing Ec. (As known in the nose region, we observe that Ec depends on the solar wind velocity and the IMF geometry. That Ec also depends on the spatial position is our new finding.) (2) These diffuse protons are more or less isotropic in the nose foreshock region but have anisotropic pancake distributions in the pre-dawn and post-dusk foreshock regions being convected with the ExB motion of the solar wind plasma. These observations provide important information on the acceleration and transport processes of diffuse protons in the foreshock region of the earth's bow shock.

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