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EP: Extraterrestrische Physik

EP 8: Poster-1

EP 8.7: Poster

Montag, 8. März 2004, 17:45–19:30, Foyer

Properties of high heliolatitude solar energetic particle events: Ulysses observations — •B. Heber¹, A. Struminsky², M.-B. Kallenrode¹, R. Müller-Mellin³, A. Klassen³, H. Kunow³, and A. Posner⁴ — ¹FB Physik, Universität Osnabrück, Germany — ²IZMIRAN, 142190 Troitsk, Moscow region, Russia — ³IEAP CAU Kiel, 24118 Kiel, Germany — ⁴SWRI, San Antonio, TX, USA

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.