The absolute intensity of the solar spectrum between 1550 A and 1950 A was measured photoelectrically by a rocketborne spectrometer flown from the Kagoshima Space Centre on 19 February 1973. The spectrometer was a single dispersive type with uniaxial Sun-pointer, and the absolute intensity from the
Observation of the absolute intensity and the centre-to-limb variation of the sun in the vacuum ultraviolet region
β Scribed by Keizo Nishi
- Publisher
- Springer
- Year
- 1973
- Tongue
- English
- Weight
- 443 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0038-0938
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β¦ Synopsis
The absolute intensities and the centre-to-limb variations of the Sun at three wavelengths of 1629 ~, 1684/k, and 1739 ~ were measured by a rocket-borne spectrometer flown from the Kagoshirna Space Centre on 1 September 1971. The spectrometer was a double-dispersive trichrometer, whose spectral and spatial resolutions were 8.3/~ 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/~ and 1684 A_ seem to support the HSRA model but not those at 1739 A..
π SIMILAR VOLUMES
The shapes of the Ca ii H and K lines in sunspot umbral spectra vary from single asymmetric peaks near the centre of the disk to almost symmetric double peaks at the limb. In addition, there are other differences in the behaviour of both H and K lines in sunspots compared to the quiet Sun. The whole