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Title: Modulation of dayside reconnection during northward interplanetary magnetic field
Authors: Provan, G. P.
Lester, M.
Cowley, S. W. H.
Grocott, Adrian
Milan, Steve E.
Hubert, B.
Khan, H.
First Published: 2005
Publisher: American Geophysical Union (AGU)
Citation: Journal of Geophysical Research: Space Physics, 2005, 110, A10211.
Abstract: 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 Bz 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 ∼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.
DOI Link: 10.1029/2004JA010980
ISSN: 0148-0227
Type: Article
Rights: This paper was published as Journal of Geophysical Research: Space Physics, 2005, 110, A10211. It is also available from Doi: 10.1029/2004JA010980
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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