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What can we learn from HF signal scattered from a discrete arc?

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journal contribution
posted on 24.10.2012, 09:22 by E. Séran, M. Godefroy, J-C. Cerisier, J-J. Berthelier, K. Kauristie, Mark Lester, L-E. Sarri
Abstract. We present observations of a discrete southward propagating arc which appeared in the mid-night sector at latitudes equatorward of main substorm activity. The arc observations were made simultaneously by the ALFA (Auroral Light Fine Analysis) optical camera, the SuperDARN-CUTLASS HF radar and the Demeter satellite during a coordinated multi-instrumental campaign conducted at the KEOPS/ESRANGE site in December 2006. The SuperDARN HF signal which is often lost in the regions of strong electron precipitation yields in our case clear backscatter from an isolated arc of weak intensity. Consequently we are able to study arc dynamics, the formation of meso-scale irregularities of the electron density along the arc, compare the arc motion with the convection of surrounding plasma and discuss the contribution of ionospheric ions in the arc erosion and its propagation.

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Citation

Annales Geophysicae, 2009, 27 (5), pp. 1887-1896

Version

VoR (Version of Record)

Published in

Annales Geophysicae

Publisher

European Geosciences Union (EGU)

issn

0992-7689

eissn

1432-0576

Copyright date

2009

Available date

24/10/2012

Publisher version

http://www.ann-geophys.net/27/1887/2009/angeo-27-1887-2009.html

Language

en

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