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EP: Fachverband Extraterrestrische Physik
EP 6: Sonne und Heliosphäre I
EP 6.4: Vortrag
Mittwoch, 14. März 2012, 14:45–15:00, V55.21
Spatial Gradients of Galactic Cosmic Ray Protons in the Inner Heliosphere - PAMELA and Ulysses Observations — •Jan Gieseler1, Mirko Boezio2, Marco Casolino3, Nicola De Simone3, Valeria Di Felice3, Bernd Heber2, and Matteo Martucci3 — 1IEAP, CAU Kiel, Kiel, Germany — 2INFN, University of Trieste, Italy — 3INFN, University of Rome "Tor Vergata", Italy
The PAMELA (Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics) space borne experiment was launched on the 15th of June 2006 and is continuously collecting data since then. The apparatus measures electrons, positrons, protons, antiprotons and heavier nuclei from about 100 MeV to several hundreds of GeV. Ulysses, launched on the 6th of October 1990, was placed in an elliptical, high inclined (80.2 degrees) orbit around the Sun, and was switched off in June 2009. It has been the only spacecraft exploring high-latitude regions of the inner heliosphere. The Kiel Electron Telescope (KET) aboard Ulysses measures electrons from 3 MeV to a few GeV and protons and helium in the energy range from 6 MeV/nucleon to above 2 GeV/nucleon. Due to the spacecraft’s trajectory, the measurements reflect not only the temporal variations but also the spatial distribution. In this contribution we combine Ulysses/KET and PAMELA measurements to determine the spatial gradients of galactic cosmic ray protons in the very low GeV-range in the inner heliosphere during the extended minimum of solar cycle 23.