Published 2012
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Evolution of suprathermal seed particle and solar energetic particle abundances
Abstract
We report on a survey of the composition of solar-wind suprathermal tails and solar energetic particles (SEPs) including data from 1998 to 2010, with a focus on 2007 to 2010. The start of solar cycle 24 included several SEP events that were unusually He-poor. We conclude that these He-poor events are more likely related to Q/M-dependent spectral variations than to seed-particle composition changes. We also find that the quiet-time suprathermal Fe/O ratio during the 2008-2009 solar-minimum was dramatically lower (Fe/O ≤ 0.01) than earlier due in part to very low solar activity, but also suggesting contributions from an oxygen-rich source of suprathermal ions of unknown origin.
Additional Information
© 2012 American Institute of Physics. NASA funded this work under grant NNX10AT75G at JHU/APL, and at Caltech under grants NNX08AI11G, NNX10AE45G, and subcontract SA2715-26309 from UC Berkeley under NASA contract NAS5-03131. We thank Eberhard Möbius and Nathan Schwadron for helpful discussions.Attached Files
Published - APC000206.pdf
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Additional details
- Eprint ID
- 31667
- Resolver ID
- CaltechAUTHORS:20120529-082347635
- NNX10AT75G
- NASA
- NNX08AI11G
- NASA
- NNX10AE45G
- NASA
- SA2715-26309
- NASA
- NAS5-03131
- NASA
- Created
-
2012-06-08Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
- Series Name
- AIP Conference Proceedings
- Series Volume or Issue Number
- 1436
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 2012-19