Aurora and airglow from colour film observations

Sandford, B. P.

doi:10.1016/0021-9169(61)90110-6

Cited by 8 publications

(2 citation statements)

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“…The criterion of choosing between "the red" and "the green" aurora was the ratio 1.5. This rough criterion is based on the spectral response of the human eye and it is connected with a visual detection level of auroral red color and comparison of this level with instrumental spectral observations (Sandford, 1961;Hanna and Anger, 1971). If the intensity of the red line exceeds 1.5 times the green line intensity in an auroral pattern, this pattern was identified as "the red" aurora.…”

Section: Data and Resultsmentioning

confidence: 99%

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First observations from a CCD all-sky spectrograph at Barentsburg (Spitsbergen)

et al. 2008

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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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Section: Data and Resultsmentioning

confidence: 99%

“…Chernouss (chernouss@pgi.kolasc.net.ru) than in the auroral oval. Besides, a large region of red luminosity in the emissions 630.0-636.4 nm (Yevlashin, 1961;Sandford, 1961;Sandholt et al, 1993Sandholt et al, , 2002 appears near the northern boundary of the oval.…”

Section: Introductionmentioning

confidence: 99%