A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study
International audience 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) wh...
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ftccsdartic:oai:HAL:hal-00316598v1 2023-12-17T10:21:48+01:00 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. Department of Physics Okayama University Department of Earth and Planetary Sciences Kobe Kobe University Laboratory for Atmospheric and Space Physics Boulder (LASP) University of Colorado Boulder 1999 https://hal.science/hal-00316598 https://hal.science/hal-00316598/document https://hal.science/hal-00316598/file/angeo-17-674-1999.pdf en eng HAL CCSD European Geosciences Union hal-00316598 https://hal.science/hal-00316598 https://hal.science/hal-00316598/document https://hal.science/hal-00316598/file/angeo-17-674-1999.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316598 Annales Geophysicae, 1999, 17 (5), pp.674-681 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1999 ftccsdartic 2023-11-19T00:35:23Z International audience 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. Article in Journal/Newspaper Antarc* Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Syowa Station |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences 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 |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
Department of Physics Okayama University Department of Earth and Planetary Sciences Kobe Kobe University Laboratory for Atmospheric and Space Physics Boulder (LASP) University of Colorado Boulder |
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 |
HAL CCSD |
publishDate |
1999 |
url |
https://hal.science/hal-00316598 https://hal.science/hal-00316598/document https://hal.science/hal-00316598/file/angeo-17-674-1999.pdf |
geographic |
Syowa Station |
geographic_facet |
Syowa Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316598 Annales Geophysicae, 1999, 17 (5), pp.674-681 |
op_relation |
hal-00316598 https://hal.science/hal-00316598 https://hal.science/hal-00316598/document https://hal.science/hal-00316598/file/angeo-17-674-1999.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1785538935099752448 |