Forward model for O2 a-band night glow limb radiance in the mesophere and lower thermosphere

Abstract

rotational structure of O2 A-band airglow 5 . At the same time, the change of A-band airglow can be used to study gravity By means of satellite load, the atmospheric temperature in the range of 60-110 km can be obtained by analyzing the band is about 94 km 4 , and during the day, the peak value of airglow is about 85 km. airglow in MLT region cannot reach the ground and can only be observed by spaceborne. At night, the peak value of A-O2 molecules widely existing when transmitted through the atmosphere. Due to this self-absorption effect, the O2 A-band in the atmosphere, and most of O2 molecules are in the ground state, the A-band airglow is absorbed by the ground state is also the studied most in O2 A-band, so A-band usually refers to this (0-0) band. Since O2 is a substance widely existing intensity 3 , and the intensity of (0-0) band is at least one order of magnitude higher than other bands. Therefore, this band composed of different vibration bands, among which O2 A (0-0) band centered at 762 nm has the largest radiation In 1954, Chamberlain et al. firstly observed the airglow radiation of O2 A-band at the same time 2 . O2 A-band airglow is target of passive remote sensing.region. It provides a tracer object for the detection of space atmospheric environment and can be used as the observation phenomena and dynamic processes in this area is still lacking. Airglow is one of the important optical phenomena in this Due to the limited and rare detection targets and new detection technologies, the actual observation of complex optical density in this area is too thin, and the interaction between neutral air molecules and electromagnetic waves is very weak.The regional structure of MLT depends on the interaction of dynamics, radiation and photochemical processes 1 . The The mesosphere and lower atmosphere (MLT) refers to the region in the atmosphere with an altitude of 60 km to 110 km.