Bremen 2000 – scientific programme
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EP: Extraterrestrische Physik
EP 9: Sonne und Heliosph
äre III
EP 9.1: Talk
Wednesday, March 22, 2000, 15:15–15:30, H1
Propagation of Jovian electrons in the inner heliosphere: 1. Ulysses observations. — •B. Heber1, P. Ferrando2, A. Raviart2, C. Paizis3, and H. Fichtner4 — 1Max-Planck-Institut für Aeronomie, Katlenburg Lindau — 2DAPNIA/Service d’Astrophysique, France — 3Universita di Milano, Italy — 4Ruhr-Universität Bochum, Germany
Since the first Jovian fly-by by Pioneer 10 in 1973, it has been established that Jupiters magnetosphere is a powerful accelerator of electrons up to several tens of MeV, which are released into interplanetary space. Measurements from Pioneer, Voyager and at Earth indicates that the Jovian electron flux exceeds the galactic one in the inner heliosphere. Since Jupiter can be regarded as a ”point” source, measurements of electrons in the inner heliosphere are ideally suited to study the transport of particles in three dimension in the inner heliosphere. In this presentation we analysed data from the Cosmic ray and Solar Particle Investigation Kiel Electron Telescope on board of Ulysses. From 1998 on Ulysses is moving to higher southern latitudes, as it did in 1993. In contrast to the earlier observations the ∼10 MeV electron flux is constant or even slightly increasing with time and not decreasing as in 1993 and as would have been predicted by an analytical model, developed by Chenette. But in contrast to the earlier observations, Ulysses is not close to Jupiter, and therefore the analytical model is not exploitable for our detailed set of observations. In this presentation we will focus on the measurements, while in an accompanying paper implications from a new numerical model will be given.