A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox
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 f...
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ftdoajarticles:oai:doaj.org/article:7e7551e5c0e049b8832129a3be81154d 2023-05-15T13:45:46+02:00 A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox H. F. Balmforth (*) M. A. Clilverd A. J. Smith https://doaj.org/article/7e7551e5c0e049b8832129a3be81154d EN eng Copernicus Publications http://www.ann-geophys.net/12/625/1994/angeo-12-625-1994.html https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 0992-7689 1432-0576 https://doaj.org/article/7e7551e5c0e049b8832129a3be81154d Annales Geophysicae, Vol 12, Iss 7, Pp 625-635 (0000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article ftdoajarticles 2022-12-31T08:07:13Z 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 N m F 2 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. Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles Faraday ENVELOPE(-64.256,-64.256,-65.246,-65.246) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 H. F. Balmforth (*) M. A. Clilverd A. J. Smith A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
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 N m F 2 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. |
format |
Article in Journal/Newspaper |
author |
H. F. Balmforth (*) M. A. Clilverd A. J. Smith |
author_facet |
H. F. Balmforth (*) M. A. Clilverd A. J. Smith |
author_sort |
H. F. Balmforth (*) |
title |
A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox |
title_short |
A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox |
title_full |
A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox |
title_fullStr |
A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox |
title_full_unstemmed |
A case study of storm commencement and recovery plasmaspheric electric fields near L=2.5 at equinox |
title_sort |
case study of storm commencement and recovery plasmaspheric electric fields near l=2.5 at equinox |
publisher |
Copernicus Publications |
url |
https://doaj.org/article/7e7551e5c0e049b8832129a3be81154d |
long_lat |
ENVELOPE(-64.256,-64.256,-65.246,-65.246) |
geographic |
Faraday |
geographic_facet |
Faraday |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Annales Geophysicae, Vol 12, Iss 7, Pp 625-635 (0000) |
op_relation |
http://www.ann-geophys.net/12/625/1994/angeo-12-625-1994.html https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 0992-7689 1432-0576 https://doaj.org/article/7e7551e5c0e049b8832129a3be81154d |
_version_ |
1766230666123411456 |