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          Institute: MPI für extraterrestrische Physik     Collection: Space Plasma Physics     Display Documents

ID: 5817.0, MPI für extraterrestrische Physik / Space Plasma Physics
Ionic charge states of solar energetic particles from solar flare events during the current rise of solar activity as observed with ACE SEPICA
Authors:Möbius, E.; Popecki, M.; Klecker, B.; Kistler, L. M.; Bogdanov, A.; Galvin, A. B.; Heirtzler, D.; Hovestadt, D.; Morris, D.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Advances in Space Research
Journal Abbrev.:Adv. Space Res.
Volume (in Journal):29
Issue / Number:10
Title of Issue:International Solar Cycle Study (ISCS) : Proceedings of the First SCOSTEP International Solar Cycle Study (ISCS) Workshop
Full Name of Issue-Editor(s):Shea, M. A.
Start Page:1501
End Page:1512
Name of Conference/Meeting:International Solar Cycle Study (ISCS) : Proceedings of the First SCOSTEP International Solar Cycle Study (ISCS) Workshop
Place of Conference/Meeting:Warsaw, Poland
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Copyright:2002 Elsevier Science
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Ionic charge states of solar energetic ions provide key information on the local temperatures and ionization processes in solar flares. In conjunction with the particle mass this measurement is a tool to study acceleration, fractionation, and transport processes. SEPICA has been designed to resolve charge state distributions in detail and to provide a large collecting power, which allows a much more detailed analysis. During November 4 - 7, 1997, a series of strong flares occurred that were magnetically well-connected. Over the energy range approximate to 0.2 - 1 MeV/nucleon a substantial increase of the charge states with energy was observed. Fe shows a charge state distribution with a distinct peak at Q approximate to 10 - 15 and a tail extending to Q approximate to 20. The newly revealed variation of the charge states with energy will potentially provide insight into modification of charge states during or after acceleration due to stripping and/or rigidity dependent acceleration processes. In addition, a sample of solar particle (SEP) events in 1998, the first year of significant solar activity during the rise of the current solar cycle, is studied for their charge state variations. Typical gradual events that resemble closely coronal composition are found with Fe charge state of approximate to11 and impulsive events with high Fe abundance and charge states between 17 and 20. In addition, there are also SEP events with charge states between 12 and 15 that show a moderate, but varying enhancement in Fe. It appears that charge states of SEPs show a much richer variation than the previously reported two groups of charge states, which is also correlated with heavy ion enrichment. (C) 2002 Published by Elsevier Science Ltd on behalf of COSPAR.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Univ New Hampshire, Dept Phys, Durham, NH 03824 USA; Univ New Hampshire, Dept Phys, Durham, NH 03824 USA; Univ New Hampshire, Inst Study Earth, Durham, NH 03824 USA; Max Planck Inst Extraterr Phys, D-85740 Garching, Germany
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