Abstract
A sequence of very bright noctilucent clouds (NLC) was observed in central Russia during the last decade of June 2018. It followed the meteorite impact 300 km southwards from Moscow in the morning of June, 21. Polarization measurements of NLC in a wide range of scattering angles allowed finding the mean size of ice particles forming the clouds, that appeared to be about 70 nm, twice a normal value. Analysis of satellite data on gravity waves, temperature, and water vapor mixing ratio during these days shows that large size of particles can be the result of mesopause cooling and shifting down to 80–82 km. Large size of particles is sufficient explanation of unusual brightness of clouds and thus does not imply the additional amount of meteoric dust.
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