The Ulysses Fast Latitude Scan at Solar Maximum: COSPIN/LET energetic particle observations

Details The Ulysses Fast Latitude Scan at Solar Maximum: COSPIN/LET energetic particle observations The Ulysses Fast Latitude Scan at Solar Maximum: COSPIN/LET energetic particle observations

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3310m&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

2

Scientific paper

Having completed the second survey of the southern polar regions of the heliosphere in late 2000, the Ulysses spacecraft is presently engaged in its second so-called Fast Latitude Scan (FSL). During this phase of the out-of-ecliptic orbit, the spacecraft makes a rapid transit from south to north, covering 160° in solar latitude in less than 320 days at relatively constant radial distance from the Sun (˜1.75 AU). In contrast to the first FSL in 1994/95 that was characterised by near-minimum solar activity conditions, the current southto-north transit is taking place near solar maximum. Striking differences in the signatures of energetic particles are already apparent when comparing the first and second south polar passes, and it is clear that this is also the case for the two FSLs. The recurrent, CIR-related, particle increases seen in 1994/95 have been replaced by large numbers of transient events, with flux enhancements continuing up to the highest southern latitudes. In this paper, we follow the progress of the energetic particle events recorded by the COSPIN/LET experiment on board Ulysses as the spacecraft returns to low latitudes, and interpret the observations in the light of the associated solar activity, local plasma conditions, and the changing position of the spacecraft. We find evidence for global latitudinal transport of particles as well as rapid onset via effective magnetic connection to the source region.

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