Propagation of Energetic particles to High Heliographic Latitudes
Abstract
The Ulysses spacecraft has now almost completed its second orbit, passing for the second time over the southern and then the northern pole of the Sun. Energetic particles associated with CMEs were observed at the highest latitudes over both poles of the Sun, quite unlike the first polar pass when, at the very highest latitudes, neither CME nor CIR accelerated particles were observed. The particle events observed over the two poles were completely different. Ulysses never left the slow solar wind as it passed over the southern pole, and events observed there tended to be similar to events observed at lower latitudes. Over the northern pole Ulysses was in the fast solar wind for several solar rotations. Events observed there differed substantially from events observed over the southern pole. Onsets were slow, particle angular distributions were almost isotropic, and increases were observed when the CME arrived. We discuss these differences in the context of the configuration of the heliosphere at the time.
- Publication:
-
AGU Spring Meeting Abstracts
- Pub Date:
- May 2004
- Bibcode:
- 2004AGUSMSH24A..03S
- Keywords:
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- 2111 Ejecta;
- driver gases;
- and magnetic clouds;
- 2114 Energetic particles;
- heliospheric (7514);
- 2162 Solar cycle variations (7536)