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Simultaneous Observation of Magnetospheric Neutral Atoms and Proton Aurora
Mende, S. B.; Frey, H. U.; Immel, T. J. et al.
2001In EOS, 42, p. 03
 

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Keywords :
2704 Auroral phenomena (2407); 2716 Energetic particles; precipitating; 2720 Energetic particles; trapped; 2740 Magnetospheric configuration and dynamics; 2788 Storms and substorms
Abstract :
[en] Data from the High Energy Neutral Atom (ENA) and the far ultraviolet (FUV) imagers on IMAGE were compared for a six hour period during which a reasonably intense substorm occurred. The substorm presented is typical of a substorm expansive phase showing that while the total electron precipitation suddenly increase one whole order of magnitude, the protons increase only about 50%. In principle ENA images represent the trapped fluxes in the magnetosphere while the proton aurora measured by the FUV SI12 instrument represents the precipitating component. At substorm onset the increase in intensity of the auroral protons and electrons is very sudden while the intensification of the ENA-s coming from regions of L<6 is much more gradual. The intensification of the precipitating electrons is relatively short lived ( ~ 10 minutes) while the ENA enhancements are long lived (almost a whole hour). Just prior to the substorm expansive phase (in the growth phase) the precipitated proton and electron fluxes encounter a minimum while the ENA-s show a slight growth.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Mende, S. B.;  Space Sciences Laboratory, University of California, Centennial Drive at Grizzly Peak Blvd., Berkeley, CA 94720 United States
Frey, H. U.;  Space Sciences Laboratory, University of California, Centennial Drive at Grizzly Peak Blvd., Berkeley, CA 94720 United States
Immel, T. J.;  Space Sciences Laboratory, University of California, Centennial Drive at Grizzly Peak Blvd., Berkeley, CA 94720 United States
Mitchell, D. G.;  The Johns Hopkins University, Johns Hopkins Road, Laurel, MD 20723 United States
Brandt, P. C.;  Johns Hopkins University
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Language :
English
Title :
Simultaneous Observation of Magnetospheric Neutral Atoms and Proton Aurora
Publication date :
01 December 2001
Journal title :
EOS
ISSN :
0096-3941
eISSN :
2324-9250
Publisher :
American Geophysical Union (AGU), Washington D.C., United States
Volume :
42
Pages :
03
Available on ORBi :
since 25 December 2009

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