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...
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ftdoajarticles:oai:doaj.org/article:88e688116b844729af69e259947f1871 2023-05-15T13:40:39+02:00 A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study O. Saka O. Watanabe K. Okada D. N. Baker 1999-05-01T00:00:00Z https://doi.org/10.1007/s00585-999-0674-4 https://doaj.org/article/88e688116b844729af69e259947f1871 EN eng Copernicus Publications https://www.ann-geophys.net/17/674/1999/angeo-17-674-1999.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-999-0674-4 0992-7689 1432-0576 https://doaj.org/article/88e688116b844729af69e259947f1871 Annales Geophysicae, Vol 17, Pp 674-681 (1999) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1999 ftdoajarticles https://doi.org/10.1007/s00585-999-0674-4 2022-12-31T14:38:37Z 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 Directory of Open Access Journals: DOAJ Articles Syowa Station Annales Geophysicae 17 5 674 681 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
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 O. Saka O. Watanabe K. Okada D. N. Baker A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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 |
O. Saka O. Watanabe K. Okada D. N. Baker |
author_facet |
O. Saka O. Watanabe K. Okada D. N. Baker |
author_sort |
O. Saka |
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 |
Copernicus Publications |
publishDate |
1999 |
url |
https://doi.org/10.1007/s00585-999-0674-4 https://doaj.org/article/88e688116b844729af69e259947f1871 |
geographic |
Syowa Station |
geographic_facet |
Syowa Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Annales Geophysicae, Vol 17, Pp 674-681 (1999) |
op_relation |
https://www.ann-geophys.net/17/674/1999/angeo-17-674-1999.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-999-0674-4 0992-7689 1432-0576 https://doaj.org/article/88e688116b844729af69e259947f1871 |
op_doi |
https://doi.org/10.1007/s00585-999-0674-4 |
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Annales Geophysicae |
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17 |
container_issue |
5 |
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674 |
op_container_end_page |
681 |
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