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| Titel |
The increase in OH rotational temperature during an active aurora event |
| VerfasserIn |
Hidehiko Suzuki, M. Tsutsumi, T. Nakamura, M. Taguchi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 28, no. 3 ; Nr. 28, no. 3 (2010-03-05), S.705-710 |
| Datensatznummer |
250016796
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| Publikation (Nr.) |
 copernicus.org/angeo-28-705-2010.pdf |
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| Zusammenfassung |
| 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. |
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