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Ionic Charge States of High Energy Solar Energetic Particles in Large Events

Sollitt, L. S. and Stone, E. C. and Mewaldt, R. A. and Cohen, C. M. S. and Leske, R. A. and Wiedenbeck, M. E. and von Rosenvinge, T. T. (2003) Ionic Charge States of High Energy Solar Energetic Particles in Large Events. In: Proceedings of the 28th International Cosmic Ray Conference. Vol.6. International Union of Applied Physics , Tokyo, Japan, pp. 3295-3299.

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We present a novel technique to infer average ionic charge states of high energy (≥ 10 MeV/nuc) solar energetic particles (SEPs) in large solar events. In some large SEP events, it is observed that higher energy SEPs decay in intensity more rapidly than at lower energies. Furthermore, this energy dependence varies with particle species, as would be expected if the decay timescale depended on a rigidity-dependent diffusive mean free path. By comparing the decay timescales of nitrogen, oxygen, neon, magnesium, silicon, sulfur, and iron to a reference element, such as carbon, charge states are inferred for these elements in several SEP events between 1997 and 2002. There is considerable variation in the inferred charge state of iron from event to event. For the November 6, 1997 event, charge states are also inferred for sodium, calcium, and nickel.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Stone, E. C.0000-0002-2010-5462
Mewaldt, R. A.0000-0003-2178-9111
Cohen, C. M. S.0000-0002-0978-8127
Leske, R. A.0000-0002-0156-2414
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:Copyright Universal Academy Press Inc. This work was supported by NASA at Caltech, JPL, and GSFC under grants NAG5-6912 and NAG5-12929.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2003-15
Record Number:CaltechAUTHORS:20150403-134653895
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56351
Deposited By: Deborah Miles
Deposited On:05 Apr 2015 22:38
Last Modified:09 Mar 2020 13:19

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