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High Energy Ionic Charge State Composition in Large Solar Energetic Particle Events

Labrador, A. W. and Leske, R. A. and Mewaldt, R. A. and Cummings, A. C. and Stone, E. C. and von Rosenvinge, T. T. (2001) High Energy Ionic Charge State Composition in Large Solar Energetic Particle Events. In: Proceedings of the 27th International Cosmic Ray Conference. Vol.8. Copernicus Systems and Technology GmbH , Berlin, Germany, pp. 3149-3152.

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Measurements of ionic charge states in solar energetic particle (SEP) events have been made at relatively high energies (> 15 MeV/nucleon) with the Mass Spectrometer Telescope (MAST) on board the Solar, Anomalous, and Magnetospheric Particle Explorer (SAMPEX) satellite using the Earth's magnetic field as a particle rigidity filter. We have examined the largest SEP events of solar cycle 23 and determined ionic charge states of Fe and other elements in several of these events. The mean charge state of Fe is often considerably higher (~20) in impulsive SEP events than in gradual events (~15). Surprisingly, in several cases, relatively high charge states of around 20 were found for Fe in very large events which are most likely gradual. Further, our measurements also show that Si in these events is not necessarily in thermal equilibrium with other elements.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Labrador, A. W.0000-0001-9178-5349
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:© Copernicus GmbH. Provided by the NASA Astrophysics Data System. This research was supported by NASA NAS5-30704 and NAGW-1919.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2001-17
Record Number:CaltechAUTHORS:20150302-112545330
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55411
Deposited By: Deborah Miles
Deposited On:04 Mar 2015 05:32
Last Modified:20 Feb 2020 14:33

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