Gradients of Galactic Cosmic Rays: Ulysses KET Results

Details Gradients of Galactic Cosmic Rays: Ulysses KET Results Gradients of Galactic Cosmic Rays: Ulysses KET Results

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsh23a..02h&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SH23A-02

Physics

2104 Cosmic Rays, 2114 Energetic Particles (7514), 2162 Solar Cycle Variations (7536)

Scientific paper

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=2.9±0.8%AU and Gθ=0.04±0.06% degree, respectively. Note, that in the current A<0-solar magnetic epoch a negative gradient was expected from previous observations in the outer heliosphere.

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