UNSPECIFIED (1998) Survey of dispersionless substorm ion injections observed by CRRES. In: D0 3 Symposium of COSPAR Scientific-Commission-D on Particle Acceleration in Space Plasmas at the 31st COSPAR Scientific Assembly, JUL 14-21, 1996, UNIV BIRMINGHAM, BIRMINGHAM, ENGLAND.

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Abstract

We present an analysis of the composition and nature of 87 dispersionless energetic (40-400 keV) ion injections observed by the MICS ion spectrometer instrument onboard CRRES during the first half of 1991. During this period the CRRES geostationary transfer orbit provided good coverage for all local times from 18:00 to 02:00, with magnetic latitudes and L-Shells in the ranges +/- 30 degrees and 4 to 8 R-E respectively, Dispersionless ion injections are associated with substorm expansion phase onset. Each injection event has been classified in terms of composition (solar wind or ionospheric rich) and prevailing magnetospheric conditions (represented by Dst). The resulting database (after correction for spacecraft sampling effects) has been used to investigate the observed spatial distribution of the events as a function of composition and Dst. These preliminary investigations illustrate the large spatial extent of dispersionless ion injections (with O+ dominating at earlier MLT) and the sharp (Dst independent) cut off of the MLT distributions at local midnight. We suggest that this corresponds to the 'average' eastern extent of the ion injection region. Furthermore, we suggest that substorms can inject particles into the ring current. (C) 1998 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:	PARTICLE ACCELERATION IN SPACE PLASMAS
Publisher:	PERGAMON PRESS LTD
ISBN:	0-08-043312-X
ISSN:	0273-1177
Editor:	Blake, JB and Slavin, JA
Date:	1998
Volume:	21
Number:	4
Number of Pages:	4
Page Range:	pp. 615-618
Publication Status:	Published
Title of Event:	D0 3 Symposium of COSPAR Scientific-Commission-D on Particle Acceleration in Space Plasmas at the 31st COSPAR Scientific Assembly
Location of Event:	UNIV BIRMINGHAM, BIRMINGHAM, ENGLAND
Date(s) of Event:	JUL 14-21, 1996
URI:	http://wrap.warwick.ac.uk/id/eprint/15624

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