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Molecular oxygen absorption of solar Lyman- alpha observed by Interkosmos-1

: Felske, D.; Martini, L.; Stark, B.; Taubenheim, J.

Nature 228 (1970), No.5278, pp.1298
ISSN: 0028-0836
ISSN: 1476-4687
Journal Article
Fraunhofer HHI ()
atmospheric composition; oxygen; solar radiation; absorption; molecular oxygen; solar lyman alpha; interkosmos 1 observations; curves of optical thickness

The satellite Interkosmos-1, was launched on October 14, 1969, into an orbit with perigee height 260 km, apogee height 640 km and an inclination of 48.4 degrees. A Lyman- alpha photometer, was mounted on the observing platform of the satellite, and directed towards the Sun with an accuracy of +or-1 degree. During the period of observation, October 15-23, 1969, the measured absolute values of solar Lyman- alpha flux varied between 3.7 and 4.7 ergs cm-2 s-1, with a mean value of 4.1 ergs cm-2 s-1. One purpose of the experiment was to measure the height-dependent absorption of Lyman- alpha in the upper atmosphere when the satellite entered the Earth's shadow ('satellite sunset').