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Ann. Geophys., 26, 1121-1125, 2008
www.ann-geophys.net/26/1121/2008/
© European Geosciences Union 2008
First observations from a CCD all-sky spectrograph at Barentsburg (Spitsbergen)
S. A. Chernouss, O. M. Sharovarova, Yu. V. Fedorenko, A. V. Roldugin, and L. S. Yevlashin
Polar Geophysical Institute of the Kola Science Centre RAS, Apatity, Murmansk region, 184200 Russia
Abstract. A digital CCD all-sky spectrograph was made by the Polar
Geophysical Institute (PGI) to support IPY activity in auroral research. The
device was tested at the Barentsburg observatory of PGI during the winter
season of 2005–2006. The spectrograph is based on a cooled CCD and a
transmission grating. The main features of this spectrograph are: a wide field
of view (~180°), a wide spectral range (380–740 nm), a spectral
resolution of 0.6 nm, a background level of about 100 R at 1-min exposure
time. Several thousand spectra of nightglow and aurora were recorded during
the observation season. It was possible to register both the strong auroral
emissions, as well as weak ones. Spectra of aurora, including nitrogen and oxygen
molecular and atomic emissions, as well as OH emissions of the nightglow are
shown. A comparison has been conducted of auroral spectra obtained by the
film all-sky spectral camera C-180-S at Spitsbergen during IGY, with spectra
obtained at Barentsburg during the last winter season. The relationship
between the red (630.0 nm) and green (557.7 nm) auroral emissions shows that
the green emission is dominant near the minimum of the solar cycle activity
(2005–2006). The opposite situation is observed during 1958–1959, with a
maximum solar cycle activity.
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