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Measurements of the Ionic Charge States of Solar Energetic Particles Using the Geomagnetic Field

Leske, R. A. and Cummings, J. R. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. (1995) Measurements of the Ionic Charge States of Solar Energetic Particles Using the Geomagnetic Field. Astrophysical Journal Letters, 452 (2). L149-L152. ISSN 2041-8205. http://resolver.caltech.edu/CaltechAUTHORS:20140304-133933580

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Abstract

The mean charge states of C, N, O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Fe, and Ni ions with ~15-70 MeV nucleon^(-1) in the two large solar energetic particle (SEP) events of 1992 October 30 and November 2 have been determined using measurements of the invariant latitude of the cosmic-ray cutoffs of these elements from the Mass Spectrometer Telescope on the polar-orbiting SAMPEX satellite. The deduced charge state values are in good agreement with the mean values measured directly in previous SEP events at much lower energies of ~1 MeV nucleon^(-1). The inferred equilibrium source temperatures are confirmed to be typically 2 × 10^6 K, which provides additional evidence that SEPs in gradual-type events are accelerated coronal material.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/309718DOIArticle
http://iopscience.iop.org/1538-4357/452/2/L149/PublisherArticle
Additional Information:© 1995 The American Astronomical Society. Received 1995 March 27; accepted 1995 August 9. This work was supported by NASA under contract NAS5-30704 and grant NAGW-1919.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAS5-30704
NASANAGW-1919
Subject Keywords:Sun: corona — Sun: flares
Record Number:CaltechAUTHORS:20140304-133933580
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140304-133933580
Official Citation:Measurements of the Ionic Charge States of Solar Energetic Particles Using the Geomagnetic Field R. A. Leske et al. 1995 ApJ 452 L149
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44127
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Mar 2014 02:37
Last Modified:29 Aug 2014 14:47

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