Stuttgart 2012 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 14: Poster Sonne und Heliosphäre

EP 14.5: Poster

Wednesday, March 14, 2012, 16:30–19:00, Poster.V

Evidence for Jupiter’s 10 h Periodicity in the Jovian Electron Spectrum at 1.2 AU From the Planet — Phillip Dunzlaff, •Bernd Heber, Andreas Klassen, and Andreas Kopp — Institut für Experiementelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel

SSince the Pioneer 10/11 mission, Jupiter is known as a dominant and almost constant source of MeV electrons in the inner heliosphere. This picture has been confirmed later by the flybys of the Voyager 1/2 and Ulysses spacecraft. An interesting feature of the Jovian electron source is the fact that Jupiter’s rotation period (∼ 10 h) can frequently be recovered in the energy spectrum of Jovian electrons in the vicinity of the planet. However, these modulation has never been convincingly reported to exist well beyond ∼0.5 AU upstream from the planet. In order to search for the 10 h modulation in the heliosphere, we re-examined Ulysses data for the second Jupiter flyby using the Lomb-Scargle spectral analysis. From day 143 to day 147 of 2004, when Ulysses was 1.2 AU away from the planet at low latitudes, a 10 h modulation was found when electrons were streaming away from Jupiter, including a so-called Jovian jet on day 145. Here we present the analysis and discuss implications for particle propagation in the IMF.