Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....68..229r&link_type=abstract
Astronomy and Astrophysics, vol. 68, no. 1-2, Aug. 1978, p. 229-238.
Astronomy and Astrophysics
Astrophysics
19
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
Scientific paper
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.
Kneubühl F. K.
Müller Erich A.
Rast J.
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