Ion Reflection, Acceleration and Transmission at the Quasi-Perpendicular Bow Shock: Cluster CIS Observations

Details Ion Reflection, Acceleration and Transmission at the Quasi-Perpendicular Bow Shock: Cluster CIS Observations Ion Reflection, Acceleration and Transmission at the Quasi-Perpendicular Bow Shock: Cluster CIS Observations

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh72a0560m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH72A-0560

Physics

2700 Magnetospheric Physics, 2772 Plasma Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Two distinct populations of reflected and accelerated ions are known to come from quasi-perpendicular shocks, gyrating ions and reflected ion beams. Recent observations under such bow shock conditions with Cluster have shown that both particle distri-butions appear to emerge from the same reflection process. The beam results from effective scattering in pitch angle during the re-flection, with, for example, very strong scattering at high Mach number shocks. The Cluster spacecraft have crossed the Earth's bow shock many times and thus have accumulated an extended database of shock crossings. We have analyzed a number of quasi-perpendicular shocks with the Cluster Ion Spectrometry experi-ment (CIS). The spatial and temporal evolution of the reflected and transmitted ion populations is studied for a variety of shock angles, Mach numbers and plasma beta. The observed event-to-event differences and temporal variations of the ion populations are related to changes of these parameters and compared with models and simulations.

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