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EP: Fachverband Extraterrestrische Physik

EP 10: Poster

EP 10.20: Poster

Mittwoch, 28. März 2007, 18:00–20:00, H46

Observation of cosmic ray decreases between 1 and 5AU — •Christian Steigies¹, Manfred Thomann¹, Alexei Struminski², Bernd Heber¹, and Robert Wimmer-Schweingruber¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel — ²Space Research Institute (IKI), Moscow, Russia

Decreases in cosmic ray count rates were first discovered with ionization chambers by Forbush. Since the early 1950s, these Forbush decreases (Fd) have been studied with Neutron Monitors and it was shown that the origin of these decreases is in the interplanetary medium. The Kiel Electron Telescope (KET) on the Ulysses mission measures intensities and energy spectra of energetic particles separating electrons, hydrogen and helium at heliospheric distances between 1 and 5 AU and latitudes from 80° South to 80° North. We use the observations from Neutron Monitors and from KET, as well as from particle detectors on other satellites like GOES, to analyze the evolution of cosmic ray decreases between Earth and Jupiter. The solar wind parameters we use for this study are measured by the ACE and Ulysses spacecrafts.