Bow Shock Specular Reflected Ions in Presence of Low Frequency Electromagnetic Waves: a Case Study

Details Bow Shock Specular Reflected Ions in Presence of Low Frequency Electromagnetic Waves: a Case Study Bow Shock Specular Reflected Ions in Presence of Low Frequency Electromagnetic Waves: a Case Study

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh72a0550m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH72A-0550

Physics

2116 Energetic Particles, Planetary, 2154 Planetary Bow Shocks, 2784 Solar Wind/Magnetosphere Interactions, 7851 Shock Waves, 7867 Wave/Particle Interactions

Scientific paper

An energetic ion event observed by CLUSTER CIS experiment upstream of the Earth's bow shock is studied in detail. The ion event is observed in association with quasi-monochromatic ULF MHD-like waves which modulate the ion fluxes. According to three statistical bow shock position models, the Cluster spacecraft are located at about .5 RE from the shock and the averaged bow shock θBN is about 30°. The analysis of the three-dimensional angular distribution indicates that ions propagating roughly along the magnetic field direction are observed at the onset of the event. Later on the angular distribution is gyrophase-bunched and the pitch-angle distribution is peaked at α0 ~ θBN consistent with the specular reflection production mechanism. The analysis of the waves shows that they are left-handed in the spacecraft frame and propagate roughly along the ambient magnetic field; we have found that they are in cyclotron resonance with the field-aligned beam observed just upstream. Using the waves and particles properties we explain the observed particle flux-modulation in term of θBN changes at the shock due to the low frequency waves and therefore consistent with the specular reflection hypothesis as the source of ions.

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