Power in the Magnetic Field Fluctuations and Diffuse Energetic Particle Density: Dependence on Distance From the Quasi-Parallel Bow Shock

Details Power in the Magnetic Field Fluctuations and Diffuse Energetic Particle Density: Dependence on Distance From the Quasi-Parallel Bow Shock Power in the Magnetic Field Fluctuations and Diffuse Energetic Particle Density: Dependence on Distance From the Quasi-Parallel Bow Shock

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm53b..01k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM53B-01

Physics

2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence, 7845 Particle Acceleration, 7868 Wave/Wave Interactions

Scientific paper

Cluster magnetic field and energetic particle data have been used in order to determine the relation between the power in the low frequency magnetic field fluctuations and the energetic ion density upstream of the quasi-parallel bow shock. In particular, we have determined the distance dependence of (1) the power in the frequency range where the waves are resonant with field-aligned beam (FAB) particles, (2) of the power in transverse fluctuations in the frequency range where the waves are resonant with diffuse energetic ions and (3) of the power in compressive fluctuations in the frequency range resonant with the diffuse ions. The power in the transverse fluctuations is about constant as a function of distance along the magnetic field from the spacecraft location to the magnetic field - bow shock intersection point, whereas the power in compressive fluctuations increases exponentially with decreasing distance. The power in fluctuations resonant with FAB particles is constant as a function of distance from the bow shock. It is suggested that the power in transverse fluctuations over a wide frequency range is due to FAB instabilities in the region closer to the foreshock boundary. These waves are convected by the solar wind into the quasi-parallel regime where they are responsible for scattering of diffuse ions. As these transverse fluctuations are convected into a regime with increasing diffuse ion density they are converted partly into compressive fluctuations.

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