The results allow us correcting the observed mesoscale temperature variances at all listed sites for contributions of instrumental and turbulent errors.
The non-coherent component may be produced by instrument errors and atmospheric turbulence. The first component can be associated with mesoscale waves near the mesopause. Comparisons of monthly variances of the temperature differences for various dt allow us to estimate coherent and non-coherent in time components of the mesoscale temperature perturbations. The filtering of mesoscale variations was made by calculations of the differences between the measured values of OH* rotational temperature separated with time intervals of dt ~ 0.5 - 2 hr. Mesoscale variations of the rotational temperature of excited hydroxyl (OH*) are studied at altitudes 85 - 90 km using the data of spectral measurements of nightglow emission at Russian observatories Zvenigorod (56 ° N, 37☎.) in years 2004 - 2016, Tory (52 ° N, 103☎) in 2012 - 2017 and Maimaga (63° N, 130° E) in 2014 - 2019.
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