Gradients of Galactic Cosmic Rays: Ulysses KET Results

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Presentation transcript:

Gradients of Galactic Cosmic Rays: Ulysses KET Results J. Gieseler(1), B. Heber(1), P. Dunzlaff(1), R. Müller-Mellin(1), R. Wimmer-Schweingruber(1), R. Gomez-Herrero(1), and R. A. Mewaldt(2). (1) Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Leibnizstr.11, D-24118 Kiel (2) California Institute of Technology 1200 East California Boulevard Pasadena, California 91125, USA Abstract: We study the spatial gradients of galactic cosmic rays in the inner heliosphere using data from the Kiel Electron Telescope (KET) aboard Ulysses and the Cosmic Ray Isotope Spectrometer (CRIS) aboard the Advanced Composition Explorer (ACE) for the time period from 1997 to 2007. This covers the solar minimum in the A>0-solar magnetic epoch, the solar magnetic reversal to an A<0-magnetic epoch at solar maximum and the declining phase of solar cycle 23. In order to calculate the galactic cosmic ray intensity distribution in the inner heliosphere we used the 125-250 MeV/nuc helium channel from KET and a combination of carbon channels from the CRIS instrument on ACE. Our analysis results in a radial and latitudinal intensity gradient of Gr=4.5±0.6%/AU and Gθ=0.03±0.04%/degree, respectively. Note, that the positive latitudinal gradient is observed in the current A<0-solar magnetic epoch, when a negative gradient was expected. Wait for Ulysses fast latitude scan in 07/08