Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsh41a..15h&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #SH41A-15
Physics
2118 Energetic Particles, Solar, 2134 Interplanetary Magnetic Fields, 7514 Energetic Particles (2114), 7519 Flares, 7851 Shock Waves
Scientific paper
We analyze 10 large solar energetic particle events detected by the Ulysses spacecraft at high heliolatitudes during the recent solar maximum polar passes. The time intensity profiles from the Ulysses KET instrument are compared with those measured by SOHO/COSTEP and GOES near Earth. Surprisingly, the intensity of < 100 MeV protons differs only by a factor of 2 to 3 at latitudes > 50°, while the corresponding intensity at Earth varies by several orders of magnitude. We find no correlation of the Ulysses peak intensities and fluences with respect to the flare location for the first two days. This implies: 1) nearly isotropic injection to high heliolatitudes, and 2) similar propagation mechanismen during the first two days of the event. We find that cross-field particle transport but not the presence of a shock establishes near equal intensities at Ulysses and in the ecliptic during the decay phase.
Heber Bernd
Kallenrode M.
Klassen Andreas
Kunow Horst
Mueller-Mellin Reinhold
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