| Autor: |
Nikolashkin, S. V., Koltovskoi, I. I., Ammosova, A. M. |
| Zdroj: |
Atmospheric & Oceanic Optics; Aug2024, Vol. 37 Issue 4, p502-507, 6p |
| Abstrakt: |
The thermodynamic state of the atmosphere and, in particular, the mesosphere, is determined by the wave structure. Noctilucent clouds are a good indicator of these wave processes. Photographic observations of noctilucent clouds in Yakutsk were used to analyze certain characteristics of the propagation of atmospheric waves. We were first to describe the observations of the so-called mesospheric bore in noctilucent clouds over eastern Siberia, recorded synchronously with two homotypic cameras. The height of the wave front determined by the triangulation method was 79 km. The case of video recording of the propagation of a few waves of different lengths in intersecting directions in noctilucent clouds on July 25, 2018, is analyzed. Analysis of the parameters of two waves propagating towards each other showed that the first had an average length of 53.5 ± 6.2 km, an average phase velocity of 98.4 ± 12 m/s, and moved northeast. The second wave of the scallop type with an average length of 14.8 ± 1.8 km propagated southwest with an average phase velocity of 61.5 ± 6 m/s. The speed of westward wind drift of all clouds was 67 ± 5 m/s. Our results will be useful for specialists in the field of physics of wave processes in the upper atmosphere. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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