Dynamics of the Mesosphere and Lower Thermosphere Based on Results of Observations on the SURA Facility

Бахметьева, Н. В.; Vyakhirev, V. D.; Grigoriev, G. I.; Egerev, M. N.; Kalinina, E. E.; Tolmacheva, A. V.; Zhemyakov, I. N.; Vinogradov, G. R.; Yusupov, Kamil

doi:10.1134/s001679322001003x

Cited by 7 publications

(5 citation statements)

References 27 publications

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“…The most typical wave periods were 10-15 min, 30-45 min, as well as 60 min and 4-6 h. Such periods of time variations are inherent in IGWs. Similar manifestations of atmospheric waves in the form of IGW were found by us in the altitude-time variations in the temperature and density, the velocity of the vertical motion of the plasma and the neutral component, the turbulent velocity and the level of the turbopause [21,22,[30][31][32]36,[43][44][45][46]50].…”

Section: Temperature Temporal Variationsupporting

confidence: 84%

“…Assuming that the horizontal velocity V x and the wavelength k x are much larger than the vertical ones, we can obtain the following estimates λ x = λ 2 z ω g 2πV z ; T wave = λ z V z . For V z = 0.5 m/s, λ z = 5 km and Brunt-Väisälä frequency ω g = 10 −2 Hz (Brunt-Väisälä period T g = 8 min), we obtained λ x = 50 km and T wave = 3.5 h. Regarding wave-like variations with such a period, we have repeatedly recorded in time variations of the amplitude and relaxation time of the scattered signal, temperature, vertical and turbulent velocities [21,22,[30][31][32]39,[43][44][45][46][50][51][52][53][54][55]. The temporal temperature variations observed in these experiments were undulating with a period from 5 min to several hours, which is typical for IGW.…”

Section: Discussionmentioning

confidence: 85%

“…The results strongly suggest that atmospheric waves, including IGWs, manifested in these variations. The basis for this statement is our long-term studies of the ionosphere by the API technique [21,22,[30][31][32]39,[43][44][45][46][50][51][52][53][54]. We estimated IGW parameters such as its horizontal wavelength k x and its period T wave .…”

Section: Discussionmentioning

confidence: 99%

“…The results of temperature determination under various ionospheric conditions are contained in [21,[27][28][29][30][31][32]. In this article, we will mainly present the results of temperature measurements in recent years including experiments conducted in September 2021.…”

Section: Methodsmentioning

confidence: 99%

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Artificial Periodic Irregularities and Temperature of the Lower Thermosphere

et al. 2023

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The results of temperature measurements in the lower thermosphere at altitudes of 90–130 km by the method of resonant scattering of radio waves on artificial periodic inhomogeneities (APIs) of the ionospheric plasma are presented. These inhomogeneities are created when the ionosphere is exposed to powerful HF radio emission. The temperature profile was obtained from measurements of the relaxation time of the API scattered signal. The data processes and the method of the temperature determination are given in detail. The height and temporal resolutions of the API technique are of the order of 1 km and 15 s, respectively, making it possible to study both fast and slow processes in the lower thermosphere. Large temperature variability at altitudes of 90–130 km during the day and from day to day, due to the propagation of atmospheric waves, has been confirmed. The temporal variations of the atmospheric parameters take place with periods from 15 min to some hours. There are often height profiles of the temperature with the wave-like variations and with the vertical scale of about 4–10 km. The irregular temperature profiles were observed above 100 km.

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Section: Temperature Temporal Variationsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Artificial Periodic Irregularities and Temperature of the Lower Thermosphere

et al. 2023

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“…The atmospheric temperature and density are determined from the API relaxation time, which is inversely proportional to the ambipolar diffusion coefficient. Many results of studying the altitude-temporal variations of temperature and density in different geo-and helio-physical conditions are presented in Reference [23][24][25][26][27][28].…”

Section: Experimental Backgroundmentioning

confidence: 99%

Study of a Gas Disturbance Mode Content Based on the Measurement of Atmospheric Parameters at the Heights of the Mesosphere and Lower Thermosphere

et al. 2021

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The main result of this work is the estimation of the entropy mode accompanying a wave disturbance, observed at the atmosphere heights range of 90–120 km. The study is the direct continuation and development of recent results on diagnosis of the acoustic wave with the separation on direction of propagation. The estimation of the entropy mode contribution relies upon the measurements of the three dynamic variables (the temperature, density, and vertical velocity perturbations) of the neutral atmosphere measured by the method of the resonant scattering of radio waves on the artificial periodic irregularities of the ionospheric plasma. The measurement of the atmosphere dynamic parameters was carried out on the SURA heating facility. The mathematical foundation of the mode separation algorithm is based on the dynamic projection operators technique. The operators are constructed via the eigenvectors of the coordinate evolution operator of the transformed system of balance equations of the hydro-thermodynamics.

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