33ND INTERNATIONAL COSMIC RAY CONFERENCE, RIO DE JANEIRO 2013 THE ASTROPARTICLE PHYSICS CONFERENCE Modulation of Jovian MeV-electrons by Corotating Interaction Regions – a modelling approach

Abstract: CIRs are recurrent structures in the solar wind characterized by a velocity jump and a magnetic field compression. Since the 1970s it is known that Jupiter is a quasi-continuous source of MeV-electrons dominating the flux in the inner heliosphere. In connection with CIRs, this flux is modulated by two effects: one has to do with the varying magnetic connectivity of the observer with the planet and the other with the changing propagation conditions in the inner heliosphere. In order to model these recurrent variations in Jovian electron intensity we used the VLUGR3-Code to solve Parker’s Transport Equation. The diffusion coefficients as well as the solar wind speed are modelled from 0.1 to 20 AU using two approaches derived by Giacalone et al. (2002) and Kissmann et al. (2004). Here we present first comparisons of the plasma parameters measured by STEREO plasma data with the Giacalone model and calculate the corresponding recurrent intensity variation at 1 AU