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| Titel |
Energetic particle measurements from the Ulysses/COSPIN/LET instrument obtained during the August/September 2005 events |
| VerfasserIn |
O. E. Malandraki, R. G. Marsden, C. Tranquille, R. J. Forsyth, H. A. Elliott, A. Geranios |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 4 ; Nr. 26, no. 4 (2008-05-13), S.1029-1037 |
| Datensatznummer |
250016076
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| Publikation (Nr.) |
 copernicus.org/angeo-26-1029-2008.pdf |
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| Zusammenfassung |
| 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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