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Some features of the day-to-day MLT wind variability in winter 2017–2018 as seen with a European/Siberian meteor radar network

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dc.contributor.author Merzlyakov E.
dc.contributor.author Solovyova T.
dc.contributor.author Yudakov A.
dc.contributor.author Korotyshkin D.
dc.contributor.author Jacobi C.
dc.contributor.author Lilienthal F.
dc.date.accessioned 2021-02-25T20:34:49Z
dc.date.available 2021-02-25T20:34:49Z
dc.date.issued 2020
dc.identifier.issn 0273-1177
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/161828
dc.description.abstract © 2019 COSPAR We present results of wind measurements near the mesopause carried out with meteor radars (MRs) at Collm (51°N, 13°E), Obninsk (55°N, 37°E), Kazan (56°N, 49°E), Angarsk (52°N, 104°E) and Anadyr (65°N, 178°E) from October 1, 2017 till March 31, 2018. The Collm and Kazan MRs are SKiYMET radars with vertical transmission and radio echo height finding, while the other radars operate with horizontal transmission and without height finding. We paid particular attention to the meridional wind variability with periods of 4–6 days and 9–11 days. The waves with these periods are seen as spots of the wave activity in the wavelet spectra and include oscillations with different periods and different discrete zonal wavenumbers. These wave packets successively propagate as a group of waves from one site to another one in such a way that they are observed at one site and almost disappear at the previous one. The 4–6 wave group includes planetary-scale oscillations (individual spectral components) which have eastward phase velocities and mostly zonal wavenumbers 2 and 3, and the vertical wavelength exceeds 70 km at middle latitudes. The source of the oscillations is the polar jet instability. The wave group itself propagates westward, and the amplitudes of wind oscillations are approximately 5–6 m/s as obtained from the wind data averaged over the meteor zone. The 9–11 day wave set propagates westward as a group and mainly consists of spectral components which have westward phase velocity and zonal wavenumber 1. Amplitudes of these wind perturbations strongly vary from station to station and can reach, approximately, 8 m/s. The vertical wavenumber is 0.014 km−1 as taken from the Kazan and 0.05 km−1 according to the Collm data. We obtained a global view on the waves by using the AURA MLS geopotential data. We found a good correspondence between wave features obtained from the MR wind measurements and the MLS data. To our knowledge, such a wave propagation of planetary wave in the mesosphere/lower thermosphere (MLT) region has so far not obtained much attention.
dc.relation.ispartofseries Advances in Space Research
dc.subject Mesosphere and lower thermosphere
dc.subject Meteor radar
dc.subject Planetary waves
dc.subject Wind measurements
dc.title Some features of the day-to-day MLT wind variability in winter 2017–2018 as seen with a European/Siberian meteor radar network
dc.type Article
dc.relation.ispartofseries-issue 6
dc.relation.ispartofseries-volume 65
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 1529
dc.source.id SCOPUS02731177-2020-65-6-SID85077651473

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  • Публикации сотрудников КФУ Scopus [22633]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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