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Solar Elemental Composition Based on Studies of Solar Energetic Particles

Cohen, C. M. S. and Mewaldt, R. A. and Leske, R. A. and Cummings, A. C. and Stone, E. C. and Wiedenbeck, M. E. and von Rosenvinge, T. T. and Mason, G. M. (2007) Solar Elemental Composition Based on Studies of Solar Energetic Particles. Space Science Reviews, 130 (1-4). pp. 183-194. ISSN 0038-6308. https://resolver.caltech.edu/CaltechAUTHORS:20100503-100012820

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Abstract

Solar abundances can be derived from the composition of the solar wind and solar energetic particles (SEPs) as well as obtained through spectroscopic means. Past comparisons have suggested that all three samples agree well, when rigidity-related fractionation effects on the SEPs were accounted for. It has been known that such effects vary from one event to the next and should be addressed on an event-by-event basis. This paper examines event variability more closely, particularly in terms of energy-dependent SEP abundances. This is now possible using detailed SEP measurements spanning several decades in energy from the Ultra Low Energy Isotope Spectrometer (ULEIS) and the Solar Isotope Spectrometer (SIS) on the ACE spacecraft. We present examples of the variability of the elemental composition with energy and suggest they can be understood in terms of diffusion from the acceleration region near the interplanetary shock. By means of a spectral scaling procedure, we obtain energy-independent abundance ratios for 14 large SEP events and compare them to reported solar wind and coronal abundances as well as to previous surveys of SEP events.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s11214-007-9218-yDOIArticle
https://rdcu.be/bPMgxPublisherFree ReadCube access
ORCID:
AuthorORCID
Cohen, C. M. S.0000-0002-0978-8127
Mewaldt, R. A.0000-0003-2178-9111
Leske, R. A.0000-0002-0156-2414
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Mason, G. M.0000-0003-2169-9618
Additional Information:© 2007 Springer Science + Business Media B.V. Received: 7 February 2007. Accepted: 19 May 2007. Published online: 21 July 2007. This work was supported by NASA at Caltech (under grants NNG04GB55G, NNG04088G, NAG5-12929), JPL, and GSFC.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANNG04GB55G
NASANNG04088G
NASANAG5-12929
JPLUNSPECIFIED
Goddard Space Flight CenterUNSPECIFIED
Subject Keywords:Sun : abundances; Sun : coronal mass ejections (CMEs); Sun : flares
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2007-17
Issue or Number:1-4
Record Number:CaltechAUTHORS:20100503-100012820
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100503-100012820
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18098
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 May 2010 04:05
Last Modified:20 Feb 2020 14:33

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