Bonn 2010 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 6: Heliosphere II

EP 6.4: Talk

Tuesday, March 16, 2010, 14:45–15:00, AKM

Time Variatons of MeV Electrons at high Latitudes and their Implications on Heliospheric Magnetic Field Models — •O. Sternal¹, R.A. Burger², P. Dunzlaff¹, N.E. Engelbrecht², S.E.S. Ferreira², H. Fichtner³, B. Heber¹, A. Kopp¹, M.S. Potgieter², and K. Scherer³ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 11, 24118 Kiel, Germany — ²School of Physics, North-West University, 2520 Potchefstroom, South Africa — ³Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany

The transport of energetic particles in the heliosphere is described by the Parker transport equation including the physical processes of diffusion, drift, convection and adiabatic energy changes. The Ulysses spacecraft provides unique insight into the flux of MeV electrons at high latitudes. In this contribution, we compare our model results for the Parker HMF model and the Fisk-type Schwadron-Parker HMF model to Ulysses measurements. The electron flux at high latitudes has been used as a remote sensing method in order investigate the imprint of a Fisk-type HMF on the their time profile. We show here for the first time that such an imprint exists and deduce a limitation of the Fisk HMF angle β.