Heidelberg 2006 – scientific programme
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EP: Extraterrestrische Physik
EP 6: Poster
EP 6.5: Poster
Tuesday, March 14, 2006, 14:00–16:30, C
COSTEP/SOHO observations of energetic electrons far upstream of the Earth’s bow–shock — •Andreas Klassen, Raul Gomez-Herrero, Eckart Böhm, Reinhold Müller-Mellin, Bernd Heber, and Robert Wimmer-Schweingruber — Institut für Experimentelle und Angewandte Physik, Universität Kiel
We have analyzed 54 electron bursts at energies above 0.25 MeV observed with the COSTEP/EPHIN instrument onboard the SOHO spacecraft far upstream of the Earth’s bow shock. Some of these upstream bursts were accompanied by energetic protons (< 1 MeV). Most of the bursts were observed during low solar activity (in 1996–1997 and in 2005) and were not associated with solar particle events.
A close correspondence between the event rate and enhancements in both solar wind speed (Vsw) and geomagnetic activity index (Ap) indicates that the observed events can be explained in terms of leakage of magnetospheric particles during enhanced geoactivity rather than acceleration at the Earth’s bow shock. We compare these data with measurements of particle bursts as well as magnetic field and solar wind parameters obtained with the Wind spacecraft.