Measurement of the solar brightness temperature near its minimum with a balloon-borne lamellar-grating interferometer.
Abstract
For the measurement of the absolute solar brightness temperature in the far-infrared, an improved balloon-borne lamellar-grating interferometer and a blackbody calibration source were built. During the first two flights in 1975/76 a flat temperature profile was observed between 60 and 110 kaysers, with a minimum of 4530 K plus 100 K/-150 K. The accuracy of this measurement permits a decision to be made in favor of the present models of the solar atmosphere. From the measured residual terrestrial absorption above 33.5 km an average water-vapor volume mixing ratio of 6.3 plus or minus 1.6 ppm is determined.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 1978
- Bibcode:
- 1978A&A....68..229R
- Keywords:
-
- Absorption Spectra;
- Atmospheric Attenuation;
- Brightness Temperature;
- Infrared Interferometers;
- Solar Temperature;
- Balloon-Borne Instruments;
- Black Body Radiation;
- Far Infrared Radiation;
- Line Spectra;
- Solar Atmosphere;
- Stellar Models;
- Solar Physics;
- Earth Atmosphere:Water Vapor;
- Interferometers;
- Sun: Brightness Temperature