2.4 micrometer sky brightness at balloon altitude

Details 2.4 micrometer sky brightness at balloon altitude 2.4 micrometer sky brightness at balloon altitude

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106.1217m&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 705, p. 1217-1221

Computer Science

Sound

9

Airglow, Balloon Sounding, Infrared Windows, Sky Brightness, Vibrational Spectra, Data Correlation, Error Analysis, In Situ Measurement, Infrared Spectra, Instrument Compensation

Scientific paper

The atmospheric airglow is thought to have a narrow window at 2.4 micrometer, which corresponds to the wavelength gap between the fundamental and the first overtone of the OH vibration bands. In order to confirm this window, we analyzed data of past balloon experiments, and found that the sky brightness, lambda Ilambda, at 2.4 micrometer amounted to (7 +/- 2) x 10-10 W/sq cm/sr or approximately 15.5 mag/sq arcsec. This level is considerably higher than expected. It can be explained, however, by assuming the nonequilibrium and partially high rotation temperature for OH radicals. This mechanism suggests that the OH window is shifted to longer wavelengths if the emission of other molecules and telescope itself is taken into account.

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