Backstreaming ion beams formed at the oblique Earth's bow shock

Details Backstreaming ion beams formed at the oblique Earth's bow shock Backstreaming ion beams formed at the oblique Earth's bow shock

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsm43b..04k&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SM43B-04

Physics

2154 Planetary Bow Shocks, 2164 Solar Wind Plasma, 2451 Particle Acceleration, 2471 Plasma Waves And Instabilities

Scientific paper

Recent observations at the Earth's bow shock with Cluster spacecraft provide new insights into time evolution of particle distributions and the reflection properties of the oblique Earth's bow shock. Field-aligned ion beams appear to emerge from the gyrating ions in the shock ramp created by the same reflection process. In fact, effective scattering in pitch angle within the shock ramp during the reflection seems to be the basic production mechanism of field-aligned ion beams. The efficiency of reflection, transmission and scattering depends on shock parameters, such as Mach number, plasma beta and shock angle. Therefore, these parameters appear to control the relative intensity of these ion beams. Meanwhile the Cluster spacecraft have crossed the Earth's bow shock many times under different interplanetary conditions. A database of shock crossings for a wide range of plasma conditions such as shock normal angle, Mach number, and plasma beta has been compiled. In a statistical study this data set is used to investigate the ion reflection and the ion beam properties at the oblique Earth bow shock in detail. The results will be compared on an event-by-event basis with results of numerical simulations and predictions from theoretical models.

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