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Distinguishing galactic cosmic-ray source models with first ionization potential and volatility

George, J. S. and Wiedenbeck, M. E. and Barghouty, A. F. and Binns, W. R. and Christian, E. R. and Cummings, A. C. and Hink, P. L. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. and Yanasak, N. E. (2001) Distinguishing galactic cosmic-ray source models with first ionization potential and volatility. Advances in Space Research, 27 (4). pp. 779-784. ISSN 0273-1177. doi:10.1016/S0273-1177(01)00116-8.

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Studies of the galactic cosmic-ray source composition reveal a pattern in the elemental abundances that may be controlled by the first ionization potential (FIP) or a closely correlated parameter, the condensation temperature (volatility). Determining the true parameter is key identifying the galactic cosmic-ray source (GCRS) material. Using data from the CRIS instrument onboard the ACE spacecraft, we examine five elements that are more volatile than other elements of similar FIP. Three of these (Na, Cu, Ge) show small deficits in their source abundances that may suggest a volatility-dependent fractionation. The source abundances of Ga and Zn (an intermediate FIP element) are consistent with either model. Possible systematic uncertainties from the cosmic-ray pathlength estimate as well as effects due to the instrumental acceptance are discussed. We also compare the GCRS composition to that observed in solar energetic particles.

Item Type:Article
Related URLs:
URLURL TypeDescription
Wiedenbeck, M. E.0000-0002-2825-3128
Binns, W. R.0000-0001-6110-3407
Christian, E. R.0000-0003-2134-3937
Cummings, A. C.0000-0002-3840-7696
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Additional Information:© 2001 COSPAR. Published by Elsevier Science Ltd. Available online 3 August 2001. This work was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, the Goddard Space Flight Center, and Washington University. We also wish to acknowledge many helpful comments from J.P. Meyer.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Goddard Space Flight CenterUNSPECIFIED
Washington UniversityUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2000-01
Issue or Number:4
Record Number:CaltechAUTHORS:20140826-132540360
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Official Citation:J.S. George, M.E. Wiedenbeck, A.F. Barghouty, W.R. Binns, E.R. Christian, A.C. Cummings, P.L. Hink, R.A. Leske, R.A. Mewaldt, E.C. Stone, T.T. von Rosenvinge, N.E. Yanasak, Distinguishing galactic cosmic-ray source models with first ionization potential and volatility, Advances in Space Research, Volume 27, Issue 4, 2001, Pages 779-784, ISSN 0273-1177, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48924
Deposited By: Ruth Sustaita
Deposited On:26 Aug 2014 20:36
Last Modified:10 Nov 2021 18:37

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