Abstract
The solar brightness temperature was measured at wavelengths between 208μ and 660μ with a lamellar-grating interferometer. In order to avoid terrestrial absorption due to water vapor the measurement of the absolute spectral brightness was performed at altitudes of 30 km and 35 km with a balloon borne gondola. A cylindrical black body radiation source served as absolute calibration standard. Its wall temperature lay between 1100 K and 1300 K. Since the box of the interferometer and the black body could not be evacuated for the calibration, the air in the system was replaced by dry nitrogen. Nevertheless, residual water vapor absorption lines hampered the precision of the absolute calibration. The corresponding error could not be reduced to less than ±100 K. The present experimental temperature profile is compared to results obtained from other measurements. The results agree with the empirical HSRA model and with those of other research groups in the spectral range between 208μ and 660μ.
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Part of the Ph.D. thesis ETH No. 5316.
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Stettler, P., Rast, J., Kneubühl, F.K. et al. Far-infrared solar brightness measured with a balloon-borne lamellar-grating interferometer. Sol Phys 40, 337–349 (1975). https://doi.org/10.1007/BF00162381
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DOI: https://doi.org/10.1007/BF00162381