Oscillation of Electron Counts at 500 eV Downstream of the Quasi-perpendicular Bow Shock

Details Oscillation of Electron Counts at 500 eV Downstream of the Quasi-perpendicular Bow Shock Oscillation of Electron Counts at 500 eV Downstream of the Quasi-perpendicular Bow Shock

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm31a..04m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM31A-04

Physics

7851 Shock Waves (4455), 7867 Wave/Particle Interactions (2483, 6984), 2154 Planetary Bow Shocks, 2728 Magnetosheath

Scientific paper

We identified oscillations of electron counts at 500 eV with periods of ~1-3 s below the proton cyclotron frequency in Cluster data. These oscillations are detected at the shock ramp and downstream within 10 min from the shock crossings. The shock normal angle is quasi-perpendicular to the magnetic field and Alfvén Mach number is supercritical. The upstream proton β is <1. The correlation of the electron counts between the three pitch angle ranges (~10, ~90, and ~170 degrees) is in-phase for all events. The correlation between the electron counts and the magnitude of the magnetic fields is often anti-phase but in-phase at a time. The magnetic variation is left-hand or right-hand polarized accompanied by field-aligned components. The oscillation of electron counts in the parallel direction might be related to the oscillation of the parallel electric potential. We can estimate these electric potential either by taking into account the shape of the electron distribution function or by using the linear hot plasma dispersion relation. The waves are inferred as Alfvén waves with oblique propagation angles from the dispersion relation. Perpendicular counts might follow parallel counts, if the adiabatic mapping is reasonable. It is possible that this kind of parallel electric potential is related to acceleration of electrons around the shock.

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