Abstract
view Abstract Citations (6) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS CN Bands in the Chromosphere. Pecker, J. -C. ; Athay, R. G. Abstract CN bands are observed in emission in the chromosphere between the photospheric limb and a height of 750 km. Spectrograms obtained by the High Altitude Observatory at the Khartoum eclipse in 1952 showed a scale height of 210 km for the intensity of the emission in the 2 2 (0, 0) band at X 3883. The emission spectrum at 100 km gives a rotation temperature of 4500 , and the photospheric absorption spectrum in the Utrecht Atlas gives a rotation temperature of 4000 . At eclipse heights other than 100 km, the data were used to determine the temperature gradient. The rotation temperature was found to increase with height. Photospheric and chromospheric models were used to predict the absolute intensity of the CN emission in this band. The predicted intensity was less than the observed intensity by a tactor of 20. The discrepancy was accounted for by uncertainties in the absorption coefficient, which was obtained from a study of the absorption profile in the Utrecht Atlas. Publication: The Astrophysical Journal Pub Date: March 1955 DOI: 10.1086/145998 Bibcode: 1955ApJ...121..391P full text sources ADS |
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