Mewaldt, R. A. and Mason, G. M. and Cohen, C. M. S. and Gómez-Herrero, R. and Haggerty, D. K. and Leske, R. A. and Wiedenbeck, M. E.
(2012)
Evolution of suprathermal seed particle and solar energetic particle abundances.
In:
Physics of the heliosphere: a 10 year retrospective.
AIP Conference Proceedings.
No.1436.
American Institute of Physics
, Melville, NY, pp. 206-211.
ISBN 978-0-7354-1026-8.
https://resolver.caltech.edu/CaltechAUTHORS:20120529-082347635
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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.
| Item Type: | Book Section |
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| 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. |
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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| NASA | NNX10AT75G | | NASA | NNX08AI11G | | NASA | NNX10AE45G | | NASA | SA2715-26309 | | NASA | NAS5-03131 |
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| Subject Keywords: | Solar energetic particles, solar wind, pickup ions, solar composition, solar flares |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 2012-19 |
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| Series Name: | AIP Conference Proceedings |
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| Issue or Number: | 1436 |
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| Classification Code: | PACS: 96.50.Vg, 96.60.Vg, 96.60.Q-, 96.50.Pw, 96.60.P-, 96.60.Qe |
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| DOI: | 10.1063/1.4723609 |
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| Record Number: | CaltechAUTHORS:20120529-082347635 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20120529-082347635 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 31667 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
Tony Diaz
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| Deposited On: | 08 Jun 2012 18:14 |
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| Last Modified: | 09 Nov 2021 19:57 |
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