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| Titel |
A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox |
| VerfasserIn |
H. F. Balmforth, M. A. Clilverd, A. J. Smith |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 12, no. 7 ; Nr. 12, no. 7, S.625-635 |
| Datensatznummer |
250010971
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| Publikation (Nr.) |
 copernicus.org/angeo-12-625-1994.pdf |
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| Zusammenfassung |
| 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. |
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