Atmospheric Turbulence and Internal Gravity Waves Examined by the Method of Artificial Periodic Irregularities

Бахметьева, Н. В.; Grigoriev, G. I.; Tolmacheva, A. V.; Kalinina, E. E.

doi:10.1134/s1990793118030041

Cited by 12 publications

(9 citation statements)

References 20 publications

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“…The API technique and methods of determination of many ionosphere parameters are presented in detail in [8]. Many results of ionosphere studies by this method are given in [16][17][18][19][20][21][22][23][24]. In this paper, we present the results of recent experiments on ionosphere studies by the API technique using the Sura heating facility.…”

Section: Methodsmentioning

confidence: 99%

“…Lidar observation, airglow imaging, measurements of the horizontal wind by meteor radar, and satellite observation allow one to determine IGW vertical and horizontal parameters from the lower atmosphere to the thermosphere [11][12][13][14][15]. Among these techniques, the method based on a scattering of high frequency radio waves by artificial periodic irregularities of the ionospheric plasma is promising [8,[16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Investigations of Atmospheric Waves in the Earth Lower Ionosphere by Means of the Method of the Creation of the Artificial Periodic Irregularities of the Ionospheric Plasma

et al. 2019

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We present results of the studies of internal gravity waves based on altitude-time dependences of the temperature and the density of the neutral component and the velocity of the vertical plasma motion at altitudes of the lower ionosphere (60–130 km). The vertical plasma velocity, which in the specified altitude range is equal to the velocity of the neutral component, the temperature, and the density of the neutral atmosphere are determined by the method of the resonant scattering of radio waves by artificial periodic irregularities (APIs) of the ionosphere plasma. We have developed an API technique and now we are evolving it for studying the ionosphere and the neutral atmosphere using the Sura heating facility (56.1 N; 46.1 E), Nizhny Novgorod, Russia. An advantage of the API technique is the opportunity to determine the parameters of the undisturbed natural environment under a disturbance of the ionosphere by a field of powerful high frequency radio waves. Analysis of altitude-time variations of the neutral temperature, the density, and the vertical plasma velocity allows one to estimate periods of atmospheric waves propagation. Wavelike variations with a period from 5 min to 3 h and more are clearly determined.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigations of Atmospheric Waves in the Earth Lower Ionosphere by Means of the Method of the Creation of the Artificial Periodic Irregularities of the Ionospheric Plasma

et al. 2019

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“…We assume that the features of the height-temporal variation of the relaxation time also cause the features of temperature variations. [42][43][44][45][46]).…”

Section: Data Processingmentioning

confidence: 99%

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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“…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%

“…Experimental data are presented in Table 1. Now, it is possible to apply out projection operators (26,27,28) and then to calculate, separately, energies for each mode, using formula (37), which need to be rewritten in the discrete form by replacement of integrals with sums, i.e., using midpoint rule. Since points are spaced, and we are interested in relative values only, simple sums can be used.…”

Section: Neutral Atmosphere Parameters Obtained Using Api Techniquementioning

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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Atmospheric Turbulence and Internal Gravity Waves Examined by the Method of Artificial Periodic Irregularities

Cited by 12 publications

References 20 publications

Investigations of Atmospheric Waves in the Earth Lower Ionosphere by Means of the Method of the Creation of the Artificial Periodic Irregularities of the Ionospheric Plasma

Investigations of Atmospheric Waves in the Earth Lower Ionosphere by Means of the Method of the Creation of the Artificial Periodic Irregularities of the Ionospheric Plasma

Artificial Periodic Irregularities and Temperature of the Lower Thermosphere

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

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