Reconfiguration of polar-cap plasma in the magnetic midnight sector

Pryse, SE, Wood, AG ORCID: https://orcid.org/0000-0002-7527-4757, Middleton, HR, McCrea, IW and Lester, M, 2006. Reconfiguration of polar-cap plasma in the magnetic midnight sector. Annales Geophysicae, 24 (8), pp. 2201-2208. ISSN 0992-7689

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Abstract

Radio tomography and the EISCAT and Super-DARN radars have been used to identify long-lived, high-altitude, cold plasma in the antisunward convective flow across the polar cap. The projection of the feature to later times suggests that it was reconfigured in the Harang discontinuity to form an enhancement that was elongated in longitude in the sunward return flow of the high-latitude convection pattern. Comparison with a tomographic image at a later time supports the interpretation of a polar patch being recon- figured into a boundary blob. There is also evidence for a second plasma enhancement equatorward of the reconfigured blob, likely to have been produced by in situ precipitation. The observations indicate that the two mechanisms proposed in the literature for the production of boundary blobs are operating simultaneously to form two distinct density features separated slightly in latitude.

Item Type:	Journal article
Publication Title:	Annales Geophysicae
Creators:	Pryse, S.E., Wood, A.G., Middleton, H.R., McCrea, I.W. and Lester, M.
Publisher:	Copernicus on behalf of the European Geosciences Union
Date:	2006
Volume:	24
Number:	8
ISSN:	0992-7689
Identifiers:	Number Type 10.5194/angeo-24-2201-2006 DOI
Rights:	© European Geosciences Union 2006.
Divisions:	Schools > School of Science and Technology
Record created by:	EPrints Services
Date Added:	09 Oct 2015 10:00
Last Modified:	09 Jun 2017 13:16
URI:	https://irep.ntu.ac.uk/id/eprint/6153

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