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Open magnetic flux and magnetic flux closure during sawtooth events

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journal contribution
posted on 27.04.2010, 15:03 by B. Hubert, Steve E. Milan, Adrian Grocott, S. W. H. Cowley, J.-C. Gérard
We use IMAGE-FUV observations of the polar aurora and measurements of the ionospheric convection from the SuperDARN radar network to study several sawtooth events previously reported in the literature. We estimate the amount of open magnetic flux in the Earth magnetosphere during a significant part of these sawtooth intervals as well as the magnetic flux opening and closure rates, that is, the dayside and nightside reconnection rates. We find that during the sawtooth intervals the magnetosphere is highly loaded with open flux as a result of the strongly southward IMF carried by the solar wind during these intervals. The magnetosphere tries to relax to a less loaded configuration through a sequence of substorm expansions. However, these substorms do not necessarily evolve to their end before reintensification of nightside reconnection occurs in response to continued loading of the magnetosphere on the dayside.

History

Citation

Geophysical Research Letters, 2008, 35, L23301.

Published in

Geophysical Research Letters

Publisher

American Geophysical Union (AGU)

issn

0094-8276

Copyright date

2008

Available date

27/04/2010

Publisher version

http://onlinelibrary.wiley.com/doi/10.1029/2008GL036374/abstract

Language

en

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