Investigation of the atmospheric tide from the data of recording barometric variations at the mid-latitude observatory «Mikhnevo»

Based on the results of instrumental observations of microimpulsions of atmospheric pressure, the main waves of the luni-solar tide in the Earth's atmosphere are identifed. The registration of micropulsations is obtained in the range from 0.1 MHz to 10 Hz in the Geophysical observatory «Mikhnevo» of Institute of Geosphere Dynamics of Russian Academy of Sciences located in the Moscow region, situated outside of the zone of the megapolis influence. The data for period 2008 - 2016 were involved. An estimate of the spectral characteristics of microimpulsions was carried out using the maximum entropy method. In order to increase the level of discrimination related to the frequencies of tidal waves, the adaptive rejection filtering method was applied. It is shown that the spectral amplitudes with frequencies that coincide with the frequencies of the tidal waves change with time with a periodicity of about 29 days. The characteristics of modulation of the solar elliptic wave $S_1$ and the main solar wave $S_2$ by periods of 13.66, 27.55 days are obtained; as well as $\sim$ 0.3, 0.5 and 1 year.