A Caltech Library Service

Determining the charge states of solar energetic ions during large geomagnetic storms

Adams, J. H., Jr. and Beaujean, R. and Boberg, P. R. and Grigorov, N. L. and Kondratyeva, M. A. and Mason, G. M. and McGuire, R. E. and Mewaldt, R. A. and Panasyuk, M. I. and Tretyakova, Ch. A. and Tylka, A. J. and Zhuravlev, D. A. (1993) Determining the charge states of solar energetic ions during large geomagnetic storms. Advances in Space Research, 13 (9). pp. 367-370. ISSN 0273-1177. doi:10.1016/0273-1177(93)90507-8.

PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We give a progress report on a new method of measuring the mean ionic charge states of solar energetic particles (SEPs) and apply this method to oxygen ions at energies of ∼10 MeV/nucleon. We compare simultaneous flux measurements inside and outside the magnetosphere to determine the geomagnetic transmission and use this result to find the corresponding mean ionic charge state. The key to this method is to determine the dependence of the geomagnetic transmission function on the mean ionic charge state of the ions. We report here the results of a new technique to calculate the geomagnetic transmission function, which attempts to account for the cutoff suppression caused by the geomagnetic activity which often accompanies SEP events.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mason, G. M.0000-0003-2169-9618
Mewaldt, R. A.0000-0003-2178-9111
Alternate Title:Measuring Charge States of Solar Energetic Ions
Additional Information:© 1993 COSPAR. Published by Elsevier. This work has been carried out as an approved activity of the US/USSR Joint Working Group on Solar-Terrestrial Physics. We thank D. I. Kozlov for the Cosmos flights. This work is supported in part by NASA contracts NAG8-678, NAG5-706, W-17,358; NASA grants NAG5-728, NGR 05-002-160, NAGW-1990; NSF grant ATM-90-23414; the National Research Council Research Associate Program; and DARA grant 50-OS-9001.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANGR 05-002-160
National Research CouncilUNSPECIFIED
Deutsche Agentur für Raumfahrtangelegenheiten (DARA)50-OS-9001
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1992-09
Issue or Number:9
Record Number:CaltechAUTHORS:20140512-111421296
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45684
Deposited By: Deborah Miles
Deposited On:12 May 2014 21:39
Last Modified:10 Nov 2021 17:15

Repository Staff Only: item control page