Energetic Particle Composition at High Helio-latitudes During the Declining Phase of Solar Cycle 23: Ulysses COSPIN/LET Observations

Details Energetic Particle Composition at High Helio-latitudes During the Declining Phase of Solar Cycle 23: Ulysses COSPIN/LET Observations Energetic Particle Composition at High Helio-latitudes During the Declining Phase of Solar Cycle 23: Ulysses COSPIN/LET Observations

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh11a0385m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH11A-0385

Physics

2102 Corotating Streams, 2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar, 7514 Energetic Particles (2114)

Scientific paper

One of the key questions to be addressed during the solar maximum phase of the Ulysses mission has been the nature of the ubiquitous energetic particle populations observed at all latitudes from equator to poles. In particular, studies of the elemental composition have been carried out in order to shed light on the likely sources of these particles. In the majority of cases, the composition signatures recorded by the COSPIN/LET experiment on board Ulysses during the recent high-latitude passes were consistent with a Solar Energetic Particle (SEP) origin (e.g., Hofer et al., GRL, in press, 2002). This result adds further evidence to the finding that energetic particles are transported with relative ease from low to high latitudes, either by enhanced cross-field diffusion, or by direct propagation along field lines that connect the polar regions of the heliosphere to active regions at lower latitudes. During the current, post-maximum, phase of its mission, Ulysses has encountered the return to more stable solar wind stream structures, leading to the formation of Corotating Interaction Regions (CIRs), in addition to the CME-associated transients. In this paper, we present the latest composition measurements from the COSPIN/LET, and interpret them in the light of the changing heliospheric structure.

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