Article (Scientific journals)
Interplanetary magnetic field control of afternoon-sector detached proton auroral arcs
Burch, J. L.; Lewis, W. S.; Immel, T. J. et al.
2002In Journal of Geophysical Research. Space Physics, 107, p. 1251
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Keywords :
Magnetospheric Physics: Auroral phenomena (2407); Magnetospheric Physics: Magnetosphere/ionosphere interactions; Magnetospheric Physics: Energetic particles; precipitating
Abstract :
[en] Data from the Far Ultraviolet Imager (FUV) on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) satellite show that subauroral proton arcs appear in the afternoon sector during geomagnetically disturbed periods when the interplanetary magnetic field rotates either from south to north or from west to east and when the magnetosphere is moderately compressed. Time series of proton aurora images show that the proton emissions are generally aligned along the equatorward part of the auroral oval. However, when interplanetary magnetic field (IMF) B[SUB]z[/SUB] changes from negative to positive the auroral oval contracts toward higher latitudes while the ring current proton precipitation remains stationary, resulting in a separation of several degrees between the latitude of the new oval position and a subauroral proton arc in the afternoon sector. A similar effect occurs when IMF B[SUB]y[/SUB] rotates from negative to positive, in which case the oval in the afternoon sector retreats toward higher latitudes, again leaving a separation between the oval and the subauroral proton arc of several degrees. Comparisons with low-altitude and geosynchronous satellite data show that the subauroral proton arc is caused by the precipitation of protons with energies from several keV to 30 keV and is likely associated with the existence of a plasmaspheric ``drainage plume.'' In contrast, the proton emissions along the main oval are caused by protons with energies generally less than 10 keV.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Burch, J. L.
Lewis, W. S.
Immel, T. J.
Anderson, P. C.
Frey, H. U.
Fuselier, S. A.
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Mende, S. B.
Mitchell, D. G.
Thomsen, M. F.
Language :
English
Title :
Interplanetary magnetic field control of afternoon-sector detached proton auroral arcs
Publication date :
01 September 2002
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
American Geophysical Union (AGU), Washington DC, United States
Volume :
107
Pages :
1251
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 26 November 2009

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