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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. http://resolver.caltech.edu/CaltechAUTHORS:20150302-112545330

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Abstract

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
http://adsabs.harvard.edu/abs/2001ICRC....8.3149LADSArticle
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
Funders:
Funding AgencyGrant Number
NASANAGW-1919
NASANAS5-30704
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-17
Record Number:CaltechAUTHORS:20150302-112545330
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150302-112545330
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55411
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:04 Mar 2015 05:32
Last Modified:04 Mar 2015 05:32

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