The association between giant pulsations (Pgs) and the auroral oval
Two features of giant pulsations (Pgs) which still require an explanation are firstly, why Pgs occur mainly in the early morning sector (i.e. 03:00-07:00 MLT) and not at other times of day, and secondly, why Pgs occur preferentially in a narrow latitudinal band (approximately 63°-68° geomagnetic lat...
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ftdoajarticles:oai:doaj.org/article:71d513a487b04e79bd6a6138f1f1ea51 2023-05-15T16:04:41+02:00 The association between giant pulsations (Pgs) and the auroral oval G. Chisham D. Orr https://doaj.org/article/71d513a487b04e79bd6a6138f1f1ea51 EN eng Copernicus Publications http://www.ann-geophys.net/12/649/1994/angeo-12-649-1994.html https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 0992-7689 1432-0576 https://doaj.org/article/71d513a487b04e79bd6a6138f1f1ea51 Annales Geophysicae, Vol 12, Iss 7, Pp 649-654 (0000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article ftdoajarticles 2022-12-31T08:52:23Z Two features of giant pulsations (Pgs) which still require an explanation are firstly, why Pgs occur mainly in the early morning sector (i.e. 03:00-07:00 MLT) and not at other times of day, and secondly, why Pgs occur preferentially in a narrow latitudinal band (approximately 63°-68° geomagnetic latitude). Using statistics from 34 Pg events observed by the EISCAT magnetometer cross, a comparison has been made between the location of the Pg resonant field lines and the equatorward edge of the auroral oval. The majority of these Pg events appear to occur just poleward of this boundary. Using these results, an explanation of the two features of Pgs as detailed above is made. This explanation involves the interaction of protons, which may be responsible for the Pg events, with the inner edge of the plasma sheet or with its ionospheric equivalent, the equatorward edge of the auroral oval. Article in Journal/Newspaper EISCAT Directory of Open Access Journals: DOAJ Articles |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
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English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 G. Chisham D. Orr The association between giant pulsations (Pgs) and the auroral oval |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Two features of giant pulsations (Pgs) which still require an explanation are firstly, why Pgs occur mainly in the early morning sector (i.e. 03:00-07:00 MLT) and not at other times of day, and secondly, why Pgs occur preferentially in a narrow latitudinal band (approximately 63°-68° geomagnetic latitude). Using statistics from 34 Pg events observed by the EISCAT magnetometer cross, a comparison has been made between the location of the Pg resonant field lines and the equatorward edge of the auroral oval. The majority of these Pg events appear to occur just poleward of this boundary. Using these results, an explanation of the two features of Pgs as detailed above is made. This explanation involves the interaction of protons, which may be responsible for the Pg events, with the inner edge of the plasma sheet or with its ionospheric equivalent, the equatorward edge of the auroral oval. |
format |
Article in Journal/Newspaper |
author |
G. Chisham D. Orr |
author_facet |
G. Chisham D. Orr |
author_sort |
G. Chisham |
title |
The association between giant pulsations (Pgs) and the auroral oval |
title_short |
The association between giant pulsations (Pgs) and the auroral oval |
title_full |
The association between giant pulsations (Pgs) and the auroral oval |
title_fullStr |
The association between giant pulsations (Pgs) and the auroral oval |
title_full_unstemmed |
The association between giant pulsations (Pgs) and the auroral oval |
title_sort |
association between giant pulsations (pgs) and the auroral oval |
publisher |
Copernicus Publications |
url |
https://doaj.org/article/71d513a487b04e79bd6a6138f1f1ea51 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Annales Geophysicae, Vol 12, Iss 7, Pp 649-654 (0000) |
op_relation |
http://www.ann-geophys.net/12/649/1994/angeo-12-649-1994.html https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 0992-7689 1432-0576 https://doaj.org/article/71d513a487b04e79bd6a6138f1f1ea51 |
_version_ |
1766400307628081152 |