Solar high resolution balloon spectra obtained in the 190-300 nm wavelength band
Abstract
To obtain solar high-resolution balloon spectra in the 190-300 nm wavelength range outside of the strong absorption ozone band, a new solar instrumentation and an equatorial mounting platform are developed. The instrumentation, which consists of a telescope-spectrograph combination, and its characteristics are described. Observations are made at an altitude of 38 km and two sequences of spectra are taken near sun center, one on a supergranular cell and the other one over an active network. The spectra recorded during the flight show an intensity variation related to the wavelength dependance of atmospheric transmission. The results obtained in two wavelength domains (190-210 nm and 272-283 nm) during the first balloon flight are presented and discussed. The spectral resolution is found to be better than 2 pm in the 200 nm range and better than 1.5 pm in the 280 nm range; and the angular resolution is found to be about 5 arcsec. Calibration in intensity is made by comparison to rocket spectra. Stigmatic line profiles illustrate the results.
- Publication:
-
Advances in Space Research
- Pub Date:
- 1984
- DOI:
- 10.1016/0273-1177(84)90449-6
- Bibcode:
- 1984AdSpR...4h..37L
- Keywords:
-
- Balloon-Borne Instruments;
- Solar Instruments;
- Solar Spectra;
- Ultraviolet Spectra;
- Solar Spectrometers;
- Spectral Resolution;
- Solar Physics