Energetic particle measurements from the Ulysses/COSPIN/LET instrument obtained during the August/September 2005 events

Details Energetic particle measurements from the Ulysses/COSPIN/LET instrument obtained during the August/September 2005 events Energetic particle measurements from the Ulysses/COSPIN/LET instrument obtained during the August/September 2005 events

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008angeo..26.1029m&link_type=abstract

Annales Geophysicae, Volume 26, Issue 4, 2008, pp.1029-1037

Physics

4

Scientific paper

We report recent observations of energetic particles at energies 1-40 MeV/n made by the COSPIN/LET instrument onboard the Ulysses spacecraft during the period of intense solar activity in August/September 2005 during the declining phase of solar cycle 23. Ulysses, having started its climb to high southern latitudes for the third time, was located at ~5 AU, at a helio-latitude of ~30 degrees south. It detected the arrival of a solar wind compound stream resulting from the merging of a series of fast halo CMEs ejected from the Sun in late August and early September 2005 and their interaction with the pre-existing pattern of solar wind Stream Interaction Regions (SIRs) in the ambient medium through which they propagated. The heavy ion intensities are observed by COSPIN/LET to remain elevated for at least 20 days following the very intense X17.0/3B solar flare on 7 September and its associated very fast CME (plane of sky projected CME speed ~2400 km s-1). We carry out an analysis of the composition of the particle increases observed at the location of the spacecraft. Although the composition signatures were predominantly Solar Energetic Particle (SEP)-like, after the passage of the compound stream over Ulysses, in association with a characteristic forward and reverse shock pair, the observations showed evidence of an enhanced He content.

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