2704 Auroral phenomena (2407); 2716 Energetic particles; precipitating; 2724 Magnetopause; cusp; and boundary layers; 2784 Solar wind/magnetosphere interactions
Abstract :
[en] The FUV instrument on IMAGE frequently observes localized ultraviolet emission on the high latitude dayside, poleward of the normal auroral oval. There are two different types of these localized emissions. One is especially distinct in the observations of Doppler shifted Lyman alpha emission from proton precipitation. This type occurs during northward IMF and high solar wind dynamic pressure. We interpret this emission as the optical signature of proton precipitation into the cusp after lobe reconnection at the magnetopause. The second type of localized emission is visible in the wide-band (WIC) and oxygen (SI13) imagers, but is absent in the proton imager. This emission occurs during northward IMF but very low solar wind density and dynamic pressure. We interpret this emission as the optical signature of electron acceleration after reconnection.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Frey, H. U.; UC Berkeley, SSL, Berkeley, CA 94720 United States
Mende, S. B.; UC Berkeley, SSL, Berkeley, CA 94720 United States
Immel, T. J.; UC Berkeley, SSL, Berkeley, CA 94720 United States
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Hubert, Benoît ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Fuselier, S. A.; LMMS, ATC, Palo Alto, CA 94304 United States
Language :
English
Title :
Two types of localized auroral UV emission on the dayside
