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Article Dans Une Revue Annales Geophysicae Année : 1998

OH(6-2) spectra and rotational temperature measurements at Davis, Antarctica

Résumé

The OH(6-2) band was monitored during 1990 at Davis, Antarctica (68.6°S, 78.0°E) using a Czerny-Turner scanning spectrometer. Spectra obtained with a 0.15-nm bandwidth and wavelength steps of 0.005 nm have been recorded in an attempt to isolate auroral features. This has enabled detailed study of weak features in the region ?837.5?855.5 nm. These weak features can contribute to the apparent intensity of P-branch lines and to the background. Their presence is allowed for in our calculation of rotational temperature, but the P1(3) line is excluded because of significant contamination. An average temperature of 221±2 K is obtained from a selected data set of 104 spectra. The mid-winter average temperature, for the months of May, June and July, is 224±2 K, which is consistent with the 1986 CIRA model values for mid-winter at this height and latitude, but this result is dependent on the choice of transition probabilities. Preliminary assessments of seasonal and diurnal variations in rotational temperature and intensity are presented.
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Dates et versions

hal-00316347 , version 1 (18-06-2008)

Identifiants

  • HAL Id : hal-00316347 , version 1

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P. A. Greet, W. J. R. French, G. B. Burns, P. F. B. Williams, R. P. Lowe, et al.. OH(6-2) spectra and rotational temperature measurements at Davis, Antarctica. Annales Geophysicae, 1998, 16 (1), pp.77-89. ⟨hal-00316347⟩
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