Ground-Based Measurement System of the OH Rotational Temperature.

Abstract

The ground-based airglow radiometer to measure the OH rotational temperature has been built. It consists of a rotating disc with eight interference filters in the near infrared wavelength region. To derive the rotational temperature it measures the zenith intensity of the 2P1, 3P1 and 4P1 branches of the OH(3-1) band as well as the background radiation around 1510 nm. It also measures the zenith intensities of the OH(3-l) Q branches, the OH(4-2) Q branches, and the 02 infrared atmospheric (0,0) band as well as the background radiation around 1245 nm. The error due to the detector noise corresponds to be within about 5 K for one data set obtained for 40 sec. A few observational results of the nocturnal variations of the rotational temperature are also presented.

Mesospheric Ozone Density Profile in the Polar Region.

“…As the diameter of each sensor was 2 mm, maximum slant incident angle of the filter was about 4.5°. There is an effect of wavelength shift for the radiation with the incident angle larger than 0°, although the effect is small (see Yamamoto et al, 1995). However, the transmission functions of the filters were corrected by taking account of this effect.…”