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Fractionation of solar energetic particles and solar wind according to first ionization potential

Mewaldt, R. A. and Cohen, C. M. S. and Leske, R. A. and Christian, E. R. and Cummings, A. C. and Stone, E. C. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2002) Fractionation of solar energetic particles and solar wind according to first ionization potential. Advances in Space Research, 30 (1). pp. 79-84. ISSN 0273-1177. doi:10.1016/S0273-1177(02)00263-6.

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Although it is well known that solar energetic particles are depleted in elements with first ionization potential (FIP) greater than ∼10 eV, it is less well known that the degree of FIP fractionation varies from event to event. Similar fractionation patterns and variations are observed in the solar wind, suggesting that these variations may have a common origin. We review evidence for the FIP-related fractionation of SEPs and compare it with FIP fractionation effects in the solar wind at 1 AU. On the basis of several significant differences between the solar wind and SEP compositions, we suggest that most solar energetic particles are not simply an accelerated sample of the average solar wind as observed at 1 AU; rather, solar particles and fast and slow solar wind appear to be distinct samples of coronal material with distinctly different FIP-fractionation patterns.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mewaldt, R. A.0000-0003-2178-9111
Cohen, C. M. S.0000-0002-0978-8127
Leske, R. A.0000-0002-0156-2414
Christian, E. R.0000-0003-2134-3937
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© 2002 COSPAR. Published by Elsevier Science Ltd. Available online 21 August 2002. This work was supported by NASA at the California Institute of Technology (under grant NAS5-6912), the Jet Propulsion Laboratory, and Goddard Space Flight Center.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Goddard Space Flight CenterUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2000-13
Issue or Number:1
Record Number:CaltechAUTHORS:20140826-110121697
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Official Citation:R.A. Mewaldt, C.M.S. Cohen, R.A. Leske, E.R. Christian, A.C. Cummings, E.C. Stone, T.T. von Rosenvinge, M.E. Wiedenbeck, Fractionation of solar energetic particles and solar wind according to first ionization potential, Advances in Space Research, Volume 30, Issue 1, 2002, Pages 79-84, ISSN 0273-1177, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48909
Deposited On:26 Aug 2014 19:54
Last Modified:10 Nov 2021 18:37

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