Simultaneous observations of energetic ions upstream and downstream of the bow shock

Details Simultaneous observations of energetic ions upstream and downstream of the bow shock Simultaneous observations of energetic ions upstream and downstream of the bow shock

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsm43b..05m&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SM43B-05

Other

2116 Energetic Particles, Planetary, 2154 Planetary Bow Shocks, 2164 Solar Wind Plasma, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

We present observations of 1-40 keV ion events observed nearly simultaneous by two Cluster spacecrafts straddling the bow shock. During such events, Cluster SC-1 is located in the magnetosheath while SC-3 is upstream of the bow shock; the 2 spacecrafts are separated by 1~RE. Typically, energetic ions appear in the magnetosheath only when upstream distribution functions are intermediate-like, with the former resulting from the convection of the latter through the shock. A systematic short time delay is observed between the flux enhancement in the sheath and the change in the upstream distribution function, corresponding to the 1~RE travel time along the field line. Other events, that are not typical, upstream and downstream energetic particle flux increases occur simultaneously. In this case, the energetic particles present in the sheath are propagating towards the shock, and therefore cannot result in such a direct manner from the upstream distributions. Initial examination of these events indicates strong evidence for leakage. We will present results from a detailed examination of how these distributions fit within a framework of shock reflection, leakage and downstream transmission, in order to determine their source and establish a likely production mechanism.

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