Seasonal-latitudinal distributions of the populations of the states O2(b1, v = 0 - 2) in the daytime mesosphere and lower thermosphere
Authors: Manuilova Rada , Yankovsky Valentine 
Published: March 2020

&lt;p&gt;In the last decade, it was shown that volume emission rates (VMR) for transitions from the levels O&lt;sub&gt;2&lt;/sub&gt;(b&lt;sup&gt;1&lt;/sup&gt;&amp;#931;&lt;sup&gt;+&lt;/sup&gt;&lt;sub&gt;g&lt;/sub&gt;, v&amp;#8217; = 0 &amp;#8211; 2) to the levels O&lt;sub&gt;2&lt;/sub&gt;(X&lt;sup&gt;3&lt;/sup&gt;&amp;#931;&lt;sup&gt;-&lt;/sup&gt;&lt;sub&gt;g&lt;/sub&gt;, v&amp;#8217;&amp;#8217;) can be used as proxies for retrieving the altitude profiles of [O(&lt;sup&gt;3&lt;/sup&gt;P )], [O&lt;sub&gt;3&lt;/sub&gt;] and [CO&lt;sub&gt;2&lt;/sub&gt;] in the mesosphere and lower thermosphere (MLT) [1, 2]. Despite the fact that, in single experiments, radiation in the bands 762, 688, and 628 nm corresponding to the abovementioned transitions were observed (e. g., [3]), no systematic measurements of the intensities of these emissions have yet been performed. The main source of excitation of the levels O&lt;sub&gt;2&lt;/sub&gt;(b&lt;sup&gt;1&lt;/sup&gt;&amp;#931;&lt;sup&gt;+&lt;/sup&gt;&lt;sub&gt;g&lt;/sub&gt;, v&amp;#8217; = 0 &amp;#8211; 2) is the energy transfer from the excited O(&lt;sup&gt;1&lt;/sup&gt;D) atom, along with the resonant absorption of solar radiation in these bands in the mesosphere.&lt;/p&gt;&lt;p&gt;In the framework of the YM2011 model of electronical-vibrational kinetics of the excited products of O&lt;sub&gt;2&lt;/sub&gt; and O&lt;sub&gt;3&lt;/sub&gt; photolysis, using systematic SABER satellite experimental data on the [O (&lt;sup&gt;1&lt;/sup&gt;D)] altitude profiles we calculated the altitudinal-latitudinal distributions of the O&lt;sub&gt;2&lt;/sub&gt;(b&lt;sup&gt;1&lt;/sup&gt;&amp;#931;&lt;sup&gt;+&lt;/sup&gt;&lt;sub&gt;g&lt;/sub&gt;, v&amp;#8217; = 0 &amp;#8211; 2) concentrations &amp;#160;and VMR in the corresponding bands, using the 2010 data as an example. It was shown that there is a seasonal dependence of the altitude profiles of the concentrations of excited states O&lt;sub&gt;2&lt;/sub&gt;(b&lt;sup&gt;1&lt;/sup&gt;&amp;#931;&lt;sup&gt;+&lt;/sup&gt;&lt;sub&gt;g&lt;/sub&gt;, v&amp;#8217; = 0 &amp;#8211; 2) obviously related to the seasonal changes of [O(&lt;sup&gt;3&lt;/sup&gt;P)] and [O&lt;sub&gt;3&lt;/sub&gt;] profiles.&lt;/p&gt;&lt;p&gt;This work was supported by the Russian Foundation for Basic Research &amp;#160;(grant RFBR No. 20-05-00450 A).&lt;/p&gt;&lt;p&gt;1. Yankovsky V. A., Martyshenko K. V., Manuilova R. O., Feofilov A. G. (2016), Oxygen dayglow emissions as proxies for atomic oxygen and ozone in the mesosphere and lower thermosphere, Journal of Molecular Spectroscopy, 327, 209-231, doi:10.1016/j.jms.2016.&lt;/p&gt;&lt;p&gt;2. Yankovsky V. A., Vorobeva E. V., Manuilova R. O. (2019), New techniques for retrieving the [O(3P)], [O3] and [CO2] altitude profiles from dayglow oxygen emissions: Uncertainty analysis by the Monte Carlo method, Advances in Space Research, 64, 1948&amp;#8211;1967, https://doi.org/10.1016/j.asr.2019.07.020&lt;/p&gt;&lt;p&gt;3. Torr M. T., Torr D. G. (1985), A Preliminary Spectroscopic Assessment of the Spacelab 1/Shuttle Optical Environment, J. Geophys. Res. A 90, 1683&amp;#8211;1690, https://doi.org/10.1029/JA090iA02p01683.&lt;/p&gt;