Mewaldt, R. A. and Cohen, C. M. S. and Leske, R. A. and Christian, E. R. and Cummings, A. C. and Slocum, P. L. and Stone, E. C. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2000) Variable fractionation of solar energetic particles according to first ionization potential. In: Acceleration and Transport of Energetic Particles Observed in the Heliosphere. AIP Conference Proceedings. No.528. American Institute of Physics , Melville, N.Y., pp. 123-126. ISBN 1-56396-951-3 http://resolver.caltech.edu/CaltechAUTHORS:20111209-071511880
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The average composition of solar energetic particles (SEPs), like the solar corona, is known to be depleted in elements with first ionization potential (FIP) more than ~10 eV by a factor of approximately four. We examine evidence for event to event variations in the FIP-related fractionation of SEPs, following up a 1994 study by Garrard and Stone. In a survey of 46 SEP events from 1974 to 1999 the deduced FIP-fractionation varies by a factor of ~2 from event to event, with no apparent relation to charge-to-mass dependent fractionation patterns in these same events. These results are compared to similar variations observed in the solar wind.
|Item Type:||Book Section|
|Additional Information:||© 2000 American Institute of Physics. Issue Date: 15 September 2000. 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|
|Subject Keywords:||solar cosmic ray particles, cosmic ray composition, element relative abundance, ionisation potential, electric charge, solar wind|
|Classification Code:||PACS: 96.40.De|
|Official Citation:||Variable fractionation of solar energetic particles according to first ionization potential R. A. Mewaldt, C. M. S. Cohen, R. A. Leske, E. R. Christian, A. C. Cummings, P. L. Slocum, E. C. Stone, T. T. von Rosenvinge, and M. E. Wiedenbeck, AIP Conf. Proc. 528, 123 (2000), DOI:10.1063/1.1324294|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||09 Dec 2011 16:08|
|Last Modified:||26 Dec 2012 14:35|
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