Solar Energetic Particles Pole-to-Pole: Ulysses COSPIN/LET Observations From the Fast Latitude Scan at Solar Maximum

Details Solar Energetic Particles Pole-to-Pole: Ulysses COSPIN/LET Observations From the Fast Latitude Scan at Solar Maximum Solar Energetic Particles Pole-to-Pole: Ulysses COSPIN/LET Observations From the Fast Latitude Scan at Solar Maximum

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh42c..05m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH42C-05

Physics

2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar, 2162 Solar Cycle Variations (7536)

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 (FLS). During this phase of the out-of-ecliptic orbit, the spacecraft makes a rapid transit from south to north, covering 160º in solar latitude in 320 days at relatively constant radial distance from the Sun. In contrast to the first FLS in 1994/95 that was characterised by near-minimum solar activity conditions, the current south-to-north transit is taking place near solar maximum. Striking differences in the signatures of energetic particles were already apparent when comparing the first and second south polar passes, and this is also the case for the two FLSs. The recurrent, CIR-related particle increases seen in 1994/95 have been replaced by large numbers of transient events, with flux enhancements up to the highest latitudes. In this paper, we follow the progress of the energetic particle events recorded by the COSPIN/LET experiment on board Ulysses during the FLS, and interpret the observations in the light of the associated solar activity, the local plasma conditions, and the changing position of the spacecraft. Special attention is given to the elemental composition of the measured fluxes.

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