A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox

Balmforth, H. F.; Clilverd, M. A. ORCID: https://orcid.org/0000-0002-7388-1529; Smith, A. J.. 1994 A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox. Annales Geophysicae, 12 (7). 625-635. 10.1007/s00585-994-0625-z

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Abstract/Summary

Data from the VLF Doppler experiment at Faraday, Antarctica (65○ S, 64○ W) are used to study the penetration of the high-latitude convection electric field to lower latitudes during severely disturbed conditions. Alterations of the electric field at L-values within the range 2.0 - 2.7 are studied for two cases at equinox (10 - 12 September 1986 and 1 - 3 May 1986). The recovery of the electric field is found to be approximately an exponential function of time. Values for the equatorial meridional E×B drift velocity, inferred from the data, are used as inputs to a model of the plasmasphere and ionosphere. The model and experimental results are used to investigate the post-storm alteration of ionospheric coupling processes. The magnitude of the effect of ionosphere-plasmasphere coupling fluxes on NmF2 values and the O+-H+ transition height is dependent on the local time of storm commencement, and on the orientation of the electric field. The coupling fluxes appear to have a maximum influence on ionospheric content during the main phase of geomagnetic activity that produces outward motion of plasmaspheric whistler ducts.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1007/s00585-994-0625-z
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	1432-0576
Date made live:	17 Jan 2017 13:46 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/515908

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