Article (Scientific journals)
Generation of transient dayside subauroral proton precipitation
Fuselier, S. A.; Gary, S. P.; Thomsen, M. F. et al.
2004In Journal of Geophysical Research. Space Physics, 109 (A12)
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Keywords :
plasma instabilities; proton precipitation; wave/particle interactions
Abstract :
[en] The Imager for Magnetopause-to-Aurora Global Exploration ( IMAGE) spacecraft obtained the first global images of the proton aurora. One of the discoveries from these images was a region of proton precipitation equatorward of the nominal auroral oval. This precipitation can be observed for similar to10 min immediately following a large solar wind pressure pulse. Various mechanisms have been proposed for producing this precipitation. This study focuses on one of the proposed mechanisms, the scattering and precipitation of protons due to interaction with electromagnetic ion cyclotron (EMIC) waves. Using data from the IMAGE spacecraft FUV and EUV imagers, in situ ring current data from the Los Alamos geosynchronous spacecraft, and in situ solar wind data from the ACE spacecraft, two features of the precipitation, the local time occurrence and limited latitudinal extent, are explained. The local time occurrence of the precipitation is correlated with the orientation of the pressure pulse front in the solar wind. The limited latitudinal extent of the emissions appears to be related to the interaction between the hot ring current protons and the cold plasmaspheric ions that gives rise to EMIC wave growth.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Fuselier, S. A.
Gary, S. P.
Thomsen, M. F.
Claflin, E. S.
Hubert, Benoît  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Sandel, B. R.
Immel, T.
Language :
English
Title :
Generation of transient dayside subauroral proton precipitation
Publication date :
30 December 2004
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
Amer Geophysical Union, Washington, United States - Washington
Volume :
109
Issue :
A12
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 June 2010

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