Observation of the absolute intensity and the centre-to-limb variation of the sun in the vacuum ultraviolet region

Abstract

The absolute intensities and the centre-to-limb variations of the Sun at three wavelengths of 1629 A, 1684 A, and 1739 A were measured by a rocket-borne spectrometer flown from the Kagoshima Space Centre on 1 September 1971. The spectrometer was a double-dispersive trichrometer, whose spectral and spatial resolutions were 8.3 A and 1.3 respectively. The results concerning the absolute intensities were similar to those measured by the Harvard College Observatory group. The results for the centre-to-limb variation at 1629 A and 1684 A seem to support the HSRA model but not those at 1739 A.