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Charge States of Solar Energetic Particles Using the Geomagnetic Cutoff Technique: SAMPEX Measurements in the 6 November 1997 Solar Particle Event

Mazur, J. E. and Mason, G. M. and Looper, M. D. and Leske, R. A. and Mewaldt, R. A. (1999) Charge States of Solar Energetic Particles Using the Geomagnetic Cutoff Technique: SAMPEX Measurements in the 6 November 1997 Solar Particle Event. Geophysical Research Letters, 26 (2). pp. 173-176. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20150107-160340345

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Abstract

We report on the ionization states of ∼0.5–50 MeV/nucleon ions in the 6 November 1997 solar particle event using instrumentation on the SAMPEX satellite and the geomagnetic cutoff technique. Using the geomagnetic cutoffs of ∼10 MeV 4He and ∼20 MeV protons, we infer the ionization states of ∼0.5–50 MeV/nucleon C-Fe by measuring their latitude distributions. The geomagnetic cutoff method extends the measurement of ionization states beyond 10 MeV/nucleon, where charge state information is inaccessible with present electrostatic deflection techniques. In contrast to an increase of the Fe charge state observed above ∼20 MeV/nucleon in events in late 1992, we find in the 6 November 1997 event that Si & Fe charge states increased dramatically across 0.5–50 MeV/nucleon. While the origin of this newly discovered energy dependence is unknown, such significant event to event variations of solar particle charge states should be considered in models of acceleration and transport processes.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/1998GL900075DOIArticle
ORCID:
AuthorORCID
Mason, G. M.0000-0003-2169-9618
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Additional Information:Copyright 1999 by the American Geophysical Union. Article first published online: 7 DEC 2012 We thank the members of the SAMPEX instrument teams who have contributed to the success of the SAMPEX mission, as well as the personnel at the Goddard Space Flight Center who constructed, launched, and operate the SAMPEX spacecraft. NASA grant NAS5-2963 supported this work.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAS 5-2963
Non-Subject Keywords:Interplanetary Physics: Energetic particles, solar Interplanetary Physics: Instruments and techniques
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1998-10
Issue or Number:2
Record Number:CaltechAUTHORS:20150107-160340345
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150107-160340345
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53302
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:09 Jan 2015 17:14
Last Modified:20 Feb 2020 14:33

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