Reference : Modulation of dayside reconnection during northward interplanetary magnetic field
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/61241
Modulation of dayside reconnection during northward interplanetary magnetic field
English
Provan, G. [> > > >]
Lester, M. [> > > >]
Cowley, S. W. H. [> > > >]
Grocott, A. [> > > >]
Milan, S. E. [> > > >]
Hubert, Benoît mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
Khan, H. [> > > >]
20-Oct-2005
Journal of Geophysical Research. Space Physics
Amer Geophysical Union
110
A10
Yes (verified by ORBi)
International
0148-0227
Washington
[en] On 17 September 2000 the IMF was directed continuously northward for more than 3 hours. Density fluctuations in the solar wind resulted in quasiperiodic variations in the solar wind dynamic pressure, and correlated fluctuations also occurred in the IMF B-z component. The Northern Hemisphere SuperDARN radars observed bursts of high-latitude high-velocity plasma flow during this northward IMF interval, both when ionospheric signatures consistent with low-latitude merging were observed and when lobe merging was occurring. On average the recurrence period of these flow bursts was similar to 22 min. During this time the SI-12 spectrographic imager channel on the IMAGE spacecraft observed the dayside proton auroral spot continuously (Frey et al., 2003a). The brightness of the auroral spot varied over time. Here we find a direct correlation between the occurrence of bursts of plasma flow and periodic fluctuations in the brightness of the proton auroral spot. Our results suggest that correlated fluctuations in the solar wind dynamic pressure and IMF Bz component modulated ionospheric precipitation and dayside reconnection, resulting in fluctuations in the brightness of the proton auroral spot and periodic variations in the dayside high-latitude plasma flow.
Researchers ; Professionals
http://hdl.handle.net/2268/61241
10.1029/2004JA010980

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