Freiburg 2008 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 4: The Sun and Heliosphere - Poster Session

EP 4.8: Poster

Montag, 3. März 2008, 17:30–19:00, Vorraum KGI-Aula

Temporal and spatial distribution of upstream particle events as observed by SEPT/STEREO — Mathias Mann, •Andreas Klassen, Raul Gomez-Herrero, Reinhold Müller-Mellin, and Bernd Heber — Universität Kiel, 24118 Kiel, Germany

The presence of energetic particles < 1 MeV upstream of the Earth's bow shock, which are streaming from the magnetosphere in the Sun direction is well known since 1960s. The origin of these particles was explained in two ways : (1) leakage of magnetospheric particles accelerated within magnetosphere, and (2)acceleration at the bow shock. Most of such upstream events were observed near the bow shock up to distances of 200 Re ( Re, Earth's radius).

We use observations of upstream electrons (55-85keV) and protons (190-220keV) detected at STEREO-A and STEREO-B between 2006, day 354 through 2007, day 243 to estimate the temporal and spatial distribution of upstream events as a function of distance from the Earth. We detected upstream events up to distances of 6500 Re from Earth and compared the rate of appearance, spatial distribution and energy range of upstream particle events for both Stereo spacecraft.