Modulation of dayside reconnection during northward interplanetary magnetic field

Provan, G. and Lester, M. and Cowley, S. W. H. and Grocott, A. and Milan, S. E. and Hubert, B. and Khan, Hina (2005) Modulation of dayside reconnection during northward interplanetary magnetic field. Journal of Geophysical Research, 110 (A10). ISSN 0148-0227

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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.

Item Type: Journal Article
Journal or Publication Title: Journal of Geophysical Research
Additional Information: Copyright 2005 by the American Geophysical Union.
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 67134
Deposited By: ep_importer_pure
Deposited On: 11 Oct 2013 12:14
Refereed?: Yes
Published?: Published
Last Modified: 24 Feb 2020 01:45
URI: https://eprints.lancs.ac.uk/id/eprint/67134

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