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The transport environment for particles in the heliosphere, e.g. galacticcosmic rays (GCRs) and MeV electrons (including those originating from Jupitersmagnetosphere), is defined by the solar wind flow and the structure of theembedded heliospheric magnetic field. Solar wind structures, such asco-rotating interaction regions (CIR), can result in periodically modulation ofboth particles species. A detailed analysis of this recurrent Jovian electronevents and galactic cosmic ray decreases measured by SOHO EPHIN is presentedhere, showing clearly a change of phase between both phenomena during the causeof the years 2007 and 2008. This effect can be explained by the change ofdifference in heliolongitude between the Earth and Jupiter, which is of centralimportance for the propagation of Jovian electrons. Furthermore, the data canbe ordered such that the 27-day Jovian electron variation vanishes in thesector which does not connect the Earth with Jupiter magnetically usingobserved solar wind speeds.

Simultaneous Analysis of Recurrent Jovian Electron Increases and Galactic Cosmic Ray Decreases