DOI: https://doi.org/10.18524/1810-4215.2019.32.182539

STUDY OF EFFECTS OF LUNAR TIDAL WAVE PASSAGE IN UPPER ATMOSPHERE OF EARTH ACCORDING TO MONITORING DATA AT RADIO TELESCOPE «URAN-4» RI NANU

M. I. Ryabov, L. I. Sobitnyak

Анотація


The paper examines data on the effects of
the lunar tidal wave in the Earth 's upper atmosphere on the
observed flux of radio sources. Monitoring of the fluxes of
powerful galactic and extragalactic radio sources is carried
out at the URAN-4 radio telescope of the Odessa Observa-
tory of the Institute of Radio Astronomy of the NAS of
Ukraine since 1987 till now. The monitoring program in-
cludes radio galaxies 3C274, 3C405 and supernova rem-
nants 3C144, 3C461. Changes of fluxes of radiation
sources at decameter waves are determined by the condi-
tion of an ionosphere resulted due to space weather varia-
tion and tidal events. When radio sources are observed
through a tidal wave, a "plasma lens" effect is realized in
the ionosphere. Depending on the position of the radio
source relative to the tidal wave, the radiation wave front is
sought. As a result, various effects are realized: strong fo-
cusing, intense flickering or "blurred" recording of the ra-
dio source. According to the data of radiation monitoring
of powerful radio sources, the dimensions and structure of
the tidal wave zone in the upper atmosphere producing the
effect of "plasma lensing" have been determined. The total
size of this zone according to observations on frequent 20
and 25 MHz is on the order of 30-60 angular degrees in
right ascension and declination.


Ключові слова


atmospheric lunar tides; upper atmosphere; radio sources

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Посилання


Brunelli B.E., Namgaladze A.A.: Ionosphere Physics, Moscow: Nauka, 1988, Chapter 5. Neutral atmosphere and processes in it. Tides. p. 281-288.

Akasofu S.I., Chapman S.: Solar terrestrial physics. Oxford, 1972, Chapter 4. Dynamics of the upper atmosphere and dynamo effect, Tidal vibrations of the atmosphere p. 343-368.

Sidorenkov N.S. Atmospheric processes and the Earth’s rotation. St. Petersburg: Hydrometeoizdat, 2002. Chapter 4 Tides and Earth's rotation. p. 75-121.

Dunkan R.A.: Lunar variations in the Ionosphere. Australian Journal of Physics, 9, 112.




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