UNSPECIFIED (1997) Survey of ring current composition during magnetic storms. In: Symposium of COSPAR Scientific Commission D on the Subauroral Ionosphere, Plasmasphere, Ring Current and Inner Magnetosphere System, at 31st COSPAR Scientific Assembly, BIRMINGHAM, ENGLAND, JUL 14-21, 1996. Published in: SUBAURORAL IONOSPHERE, PLASMASPHERE, RING CURRENT AND INNER MAGNETOSPHERE SYSTEM, 20 (3). pp. 321-326. ISBN 0-08-043299-9. ISSN 0273-1177.

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Abstract

During geomagnetic storms, the ring current is substantially modified and intensified. We use data from the MICS instrument on CRRES to investigate composition changes in magnetospheric ions in the energy range 20-400 keV/e. These are related to the Dst signature of the storm. Long term survey plots of MICS data show that during storms there is an initial increase of ionospheric material at around L=3. The peak in the ratio of ionospheric material rises to higher L-shells during the storm recovery. By contrast, solar wind material remains predominantly at higher L-shells, and a belt of ring current alpha particles forms around L=4. The L-shell of the peak fraction of ionospheric material is a strong function of Dst. Substorm composition reflects the background composition at that L-shell. These results are emphasised by a superposed epoch analysis of substorm injection composition. It shows that the composition of storm time injections is similar to a set of oxygen rich injections. We conclude that, during the solar maximum interval which CRRES observed, substorms are not directly responsible for the ring current oxygen population. (C) 1997 COSPAR. Published by Elsevier Science Ltd.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics Q Science > QB Astronomy Q Science > QE Geology Q Science > QC Physics
Series Name:	ADVANCES IN SPACE RESEARCH
Journal or Publication Title:	SUBAURORAL IONOSPHERE, PLASMASPHERE, RING CURRENT AND INNER MAGNETOSPHERE SYSTEM
Publisher:	PERGAMON PRESS LTD
ISBN:	0-08-043299-9
ISSN:	0273-1177
Editor:	Chen, MW
Official Date:	1997
Dates:	Date Event 1997 UNSPECIFIED
Volume:	20
Number:	3
Number of Pages:	6
Page Range:	pp. 321-326
Publication Status:	Published
Title of Event:	Symposium of COSPAR Scientific Commission D on the Subauroral Ionosphere, Plasmasphere, Ring Current and Inner Magnetosphere System, at 31st COSPAR Scientific Assembly
Location of Event:	BIRMINGHAM, ENGLAND
Date(s) of Event:	JUL 14-21, 1996

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