Freiburg 2008 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 4: The Sun and Heliosphere - Poster Session

EP 4.17: Poster

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

Are there Kronian electrons in the inner heliosphere? — Dennie Lange and •Horst Fichtner — Theoretische Physik IV, Weltraum- und Astrophysik, Ruhr-Universität Bochum

So far the Jovian magnetosphere as the largest in our solar system is treated in the literature as the dominant source of a few MeV electrons. On the basis of a time-dependent three-dimensional modulation model the transport of MeV electrons in the heliosphere is simulated. For this purpose the cosmic rays, the Jovian and the Saturnian electron source are considered together in the simulation of electron fluxes. The simulated electron intensities are discussed along the Ulysses and Cassini trajectories. The strength of the electron source at Jupiter is relatively well known and modelled. To determine the source strength of Saturn in comparison to that of Jupiter, we compare all available spacecraft measurements at Jupiter/Saturn in the overlaping energy range. Especially the study of the particle diffusion is of great relevance, because the really unknown function in the used transport equation is the diffusion tensor. The Jovian and/or Kronian electrons are in doing so very suitable to study the transport of energetic particles. All results effect clearly the intensities along the Ulysses and the Cassini trajectories. Our results reveal that the electrons from the Kronian magnetosphere, as the second largest, can not be neglected in the low MeV energy range.