Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/7818
Title: Superposed epoch analysis of the ionospheric convection evolution during substorms: onset latitude dependence
Authors: Grocott, Adrian
Wild, J.A.
Milan, Steve E.
Yeoman, Tim K.
First Published: 6-Feb-2009
Publisher: Copernicus Publications on behalf of the European Geosciences Union
Citation: Annales Geophysicae, 2009, 27 (2), pp. 591-600.
Abstract: Using data from the Super Dual Auroral Radar Network (SuperDARN) we investigate the ionospheric convection response to magnetospheric substorms. Substorms were identified using the Far Ultraviolet (FUV) instrument on board the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft, and were then binned according to the magnetic latitude of their onset. A superposed epoch analysis of the ionospheric convection patterns for each onset-latitude bin was then performed using radar data for the interval 60 min before onset to 90 min after. It is found that lower onset-latitude substorms are associated with generally more enhanced convection than the higher latitude substorms, although they suffer from a significant localised reduction of the flow in the midnight sector during the expansion phase. Higher-latitude substorms are associated with a significant and rapid increase in the nightside convection following substorm onset, with all onset-latitude bins showing an enhancement over onset values by ~60 min into the expansion phase. A rudimentary inspection of the concurrent auroral evolution suggests that the duration of the flow reduction following substorm onset is dependent on the strength and duration of the expansion phase aurora and its associated conductivity enhancement.
DOI Link: 10.5194/angeo-27-591-2009
ISSN: 0992-7689
Links: http://www.ann-geophys.net/27/591/2009/angeo-27-591-2009.html
http://hdl.handle.net/2381/7818
Type: Article
Description: This paper was published as Annales Geophysicae, 2009, 27 (2), pp. 591-600. It is also available from http://www.ann-geophys.net/27/591/2009/angeo-27-591-2009.html
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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