Article (Scientific journals)
Dynamics of global scale electron and proton precipitation induced by a solar wind pressure pulse
Meurant, M.; Gérard, Jean-Claude; Hubert, Benoît et al.
2003In Geophysical Research Letters, 30 (20)
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Keywords :
aurora; ultraviolet; solar wind; dynamics; shock
Abstract :
[en] [1] On April 28 2001, simultaneous global images of electron and proton aurora were obtained by IMAGE- FUV following a sudden increase of solar wind dynamic pressure. The local time and intensity distribution of both types of precipitation are examined and compared. It is found that the electron and the proton precipitation both start in the post noon sector and expand concurrently, but the expansion into the nightside starts sooner for the protons than for the electrons. The characteristic rise time in the onset sector is on the order of 6 minutes. A distinct dynamics and morphology of electron and proton precipitation is observed in the nightside sector. DMSP electron measurements in the afternoon sector indicate that the shock has a significant effect on the electron spectral characteristics. It is suggested that the various Alfven frequencies generated by the shock account for the two different speeds of propagation of the disturbance.
Disciplines :
Earth sciences & physical geography
Space science, astronomy & astrophysics
Author, co-author :
Meurant, M.
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys.
Hubert, Benoît  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Coumans, Valérie ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Blockx, Caroline ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Ostgaard, N.
Mende, S. B.
Language :
English
Title :
Dynamics of global scale electron and proton precipitation induced by a solar wind pressure pulse
Publication date :
18 October 2003
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
American Geophysical Union (AGU), Washington, United States - District of Columbia
Volume :
30
Issue :
20
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 06 March 2009

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