Abstract
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.
Highlights
It is well known that atmospheric waves are one part of the ionosphere dynamics
The artificial periodic irregularities (APIs) technique is based on ionosphere perturbation by powerful high frequency radio emission, and the creation of periodic irregularities in the field of a standing wave formed by the reflection from the ionosphere of the powerful radio wave emitted by the heating facility to zenith
We presented some examples of the API observations in the previous section
Summary
It is well known that atmospheric waves are one part of the ionosphere dynamics. They usually propagate at different heights of the Earth’s atmosphere, including those in the lower ionosphere [1,2,3]. 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]. All the results were obtained by a method based on creating artificial periodic irregularities in ionospheric plasma by its disturbance with high-frequency radio emission from the Sura heating facility
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