The increase in OH rotational temperature during an active aurora event
OH rotational temperatures have been observed at the Syowa Station, Antarctica (69° S, 39° E), which is located in the middle of the auroral zone and has a high-sensitivity spectrometer for the spectral region of the OH 8-4 band. A dataset of 153 nights was acquired during the 200...
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doaj-a3cbf543fd8f41dfa77ac569a633f1cb2020-11-24T22:28:11ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762010-03-012870571010.5194/angeo-28-705-2010The increase in OH rotational temperature during an active aurora eventH. Suzuki0M. Tsutsumi1T. Nakamura2M. Taguchi3Graduate University for Advanced Studies, 10-3 Midoricho, Tachikawa city, Tokyo, 190-8518, JapanNational Institute of Polar Research, 10-3 Midoricho, Tachikawa city, Tokyo, 190-8518, JapanNational Institute of Polar Research, 10-3 Midoricho, Tachikawa city, Tokyo, 190-8518, JapanRikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, JapanOH rotational temperatures have been observed at the Syowa Station, Antarctica (69° S, 39° E), which is located in the middle of the auroral zone and has a high-sensitivity spectrometer for the spectral region of the OH 8-4 band. A dataset of 153 nights was acquired during the 2008 austral winter season. Of the 153 nights, the weather and aurora conditions were only suitable on 6 nights to study the relationship between auroral activity and OH airglow variation. Of these 6 nights, a significant increase in the rotational temperature and a decrease in the intensity related to an aurora activity were identified on the night of 27/28 March 2008, but no such variations were seen during the other nights. The horizontal magnetic field disturbance on the night of 27/28 March was the largest of that winter, while the cosmic radio noise absorption was also very strong. These facts indicate that, compared with the other nights, a large flux of high-energy auroral particles precipitated during the night. It is suggested that the observed variations in the OH rotational temperature and airglow intensity were caused by a lowering of the average airglow height as a result of OH depletion in the upper part of the layer where high-energy auroral particles can reach.https://www.ann-geophys.net/28/705/2010/angeo-28-705-2010.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
H. Suzuki M. Tsutsumi T. Nakamura M. Taguchi |
spellingShingle |
H. Suzuki M. Tsutsumi T. Nakamura M. Taguchi The increase in OH rotational temperature during an active aurora event Annales Geophysicae |
author_facet |
H. Suzuki M. Tsutsumi T. Nakamura M. Taguchi |
author_sort |
H. Suzuki |
title |
The increase in OH rotational temperature during an active aurora event |
title_short |
The increase in OH rotational temperature during an active aurora event |
title_full |
The increase in OH rotational temperature during an active aurora event |
title_fullStr |
The increase in OH rotational temperature during an active aurora event |
title_full_unstemmed |
The increase in OH rotational temperature during an active aurora event |
title_sort |
increase in oh rotational temperature during an active aurora event |
publisher |
Copernicus Publications |
series |
Annales Geophysicae |
issn |
0992-7689 1432-0576 |
publishDate |
2010-03-01 |
description |
OH rotational temperatures have been observed at the Syowa Station,
Antarctica (69° S, 39° E), which is located in the middle of the
auroral zone and has a high-sensitivity spectrometer for the spectral region
of the OH 8-4 band. A dataset of 153 nights was acquired during the 2008
austral winter season. Of the 153 nights, the weather and aurora conditions
were only suitable on 6 nights to study the relationship between auroral
activity and OH airglow variation. Of these 6 nights, a significant increase
in the rotational temperature and a decrease in the intensity related to an
aurora activity were identified on the night of 27/28 March 2008, but no
such variations were seen during the other nights. The horizontal magnetic
field disturbance on the night of 27/28 March was the largest of that
winter, while the cosmic radio noise absorption was also very strong. These
facts indicate that, compared with the other nights, a large flux of
high-energy auroral particles precipitated during the night. It is suggested
that the observed variations in the OH rotational temperature and airglow
intensity were caused by a lowering of the average airglow height as a
result of OH depletion in the upper part of the layer where high-energy
auroral particles can reach. |
url |
https://www.ann-geophys.net/28/705/2010/angeo-28-705-2010.pdf |
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