A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study
An intensification of auroral luminosity referred to as an auroral break-up often accompanies the onset of geomagnetic pulsation (Pi 2) at the dip-equator. One such auroral break-up occurred at 2239 UT on 16 June, 1986, being accompanied by weak substorm activity (AE~50 nT) which was recorded in all...
Published in: | Annales Geophysicae |
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Springer Verlag
1999
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00037076 2023-05-15T14:02:33+02:00 A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study Saka, O. Watanabe, O. Okada, K. Baker, D. N. 1999-05 electronic https://doi.org/10.1007/s00585-999-0674-4 https://noa.gwlb.de/receive/cop_mods_00037076 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00037030/angeo-17-674-1999.pdf https://angeo.copernicus.org/articles/17/674/1999/angeo-17-674-1999.pdf eng eng Springer Verlag Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.1007/s00585-999-0674-4 https://noa.gwlb.de/receive/cop_mods_00037076 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00037030/angeo-17-674-1999.pdf https://angeo.copernicus.org/articles/17/674/1999/angeo-17-674-1999.pdf https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 1999 ftnonlinearchiv https://doi.org/10.1007/s00585-999-0674-4 2022-02-08T22:43:43Z An intensification of auroral luminosity referred to as an auroral break-up often accompanies the onset of geomagnetic pulsation (Pi 2) at the dip-equator. One such auroral break-up occurred at 2239 UT on 16 June, 1986, being accompanied by weak substorm activity (AE~50 nT) which was recorded in all-sky image of Syowa Station, Antarctica (66.2°S, 71.8°E in geomagnetic coordinates). The associated Pi 2 magnetic pulsation was detected by a fluxgate magnetometer in the afternoon sector at the dip-equator (Huancayo, Peru; 1.44°N, 355.9° in geomagnetic coordinates; 12.1°S, 75.2°W in geographic coordinates; L=1.00). In spite of the large separation of the two stations in longitude and latitude, the auroral break-up and subsequent luminosity modulation were seen to be correlated with the wave form of the ground Pi 2 pulsation. This occurred in such a way that the luminosity maximum was seen to occur at the phase of maximum amplitudes of Pi 2 wave form. We argue that the observed correlation could be interpreted as indicating a Pi 2-modulation of a field-aligned acceleration of the low energy electrons that may occur near the equator of the midnight magnetosphere. Key words. Magnetospheric physics (auroral phenomena; energetic particles · precipitating; MHD waves and instabilities) Article in Journal/Newspaper Antarc* Antarctica Niedersächsisches Online-Archiv NOA Syowa Station Annales Geophysicae 17 5 674 681 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Saka, O. Watanabe, O. Okada, K. Baker, D. N. A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study |
topic_facet |
article Verlagsveröffentlichung |
description |
An intensification of auroral luminosity referred to as an auroral break-up often accompanies the onset of geomagnetic pulsation (Pi 2) at the dip-equator. One such auroral break-up occurred at 2239 UT on 16 June, 1986, being accompanied by weak substorm activity (AE~50 nT) which was recorded in all-sky image of Syowa Station, Antarctica (66.2°S, 71.8°E in geomagnetic coordinates). The associated Pi 2 magnetic pulsation was detected by a fluxgate magnetometer in the afternoon sector at the dip-equator (Huancayo, Peru; 1.44°N, 355.9° in geomagnetic coordinates; 12.1°S, 75.2°W in geographic coordinates; L=1.00). In spite of the large separation of the two stations in longitude and latitude, the auroral break-up and subsequent luminosity modulation were seen to be correlated with the wave form of the ground Pi 2 pulsation. This occurred in such a way that the luminosity maximum was seen to occur at the phase of maximum amplitudes of Pi 2 wave form. We argue that the observed correlation could be interpreted as indicating a Pi 2-modulation of a field-aligned acceleration of the low energy electrons that may occur near the equator of the midnight magnetosphere. Key words. Magnetospheric physics (auroral phenomena; energetic particles · precipitating; MHD waves and instabilities) |
format |
Article in Journal/Newspaper |
author |
Saka, O. Watanabe, O. Okada, K. Baker, D. N. |
author_facet |
Saka, O. Watanabe, O. Okada, K. Baker, D. N. |
author_sort |
Saka, O. |
title |
A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study |
title_short |
A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study |
title_full |
A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study |
title_fullStr |
A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study |
title_full_unstemmed |
A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study |
title_sort |
slow mode wave as a possible source of pi 2 and associated particle precipitation: a case study |
publisher |
Springer Verlag |
publishDate |
1999 |
url |
https://doi.org/10.1007/s00585-999-0674-4 https://noa.gwlb.de/receive/cop_mods_00037076 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00037030/angeo-17-674-1999.pdf https://angeo.copernicus.org/articles/17/674/1999/angeo-17-674-1999.pdf |
geographic |
Syowa Station |
geographic_facet |
Syowa Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.1007/s00585-999-0674-4 https://noa.gwlb.de/receive/cop_mods_00037076 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00037030/angeo-17-674-1999.pdf https://angeo.copernicus.org/articles/17/674/1999/angeo-17-674-1999.pdf |
op_rights |
https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00585-999-0674-4 |
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Annales Geophysicae |
container_volume |
17 |
container_issue |
5 |
container_start_page |
674 |
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681 |
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