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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 5, pp. 321-339

The influence of Lunar-Solar gravity tide on the dynamics of atmosphere, ionosphere and ocean

D.S. Khabituev 1 , B.G. Shpynev 1 , A.V. Tatarnikov 1 , S.E. Scheglova 1 
1 Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia
Accepted: 06.10.2017
DOI: 10.21046/2070-7401-2017-14-5-321-339
In this study we have carried out an investigation of day-to-day variations of geophysical parameters in atmosphere, ionosphere and ocean, caused by Lunar and Solar gravity tide. The main purpose of the study is to reveal the low-frequency (1–35 days) harmonics of solar-lunar gravity tide in variations of geophysical parameters. It is shown that combined Lunar-Solar tide is a complicated multimodal oscillation that changes with a number of periodicities, including syzygy period of 13.66 days and periods of lunar knots motion ~18.6 years. This investigation is performed by using the technique of current (sliding) spectrum, which allows complex time-frequency analysis of long data series. It is found that the strongest long-period gravitational tidal harmonics appear in variations of geomagnetic field and in ionosphere. In the troposphere and oceans the gravity tide produces indirect influence on these systems because they have their own internal oscillation modes which depend on orographic effects for atmosphere and on cost/bottom shape for oceans. Interaction of gravity tide with atmosphere and ocean systems can be considered as a self-oscillating system with the gravity tide as the determined external amplifier. This interaction produces in atmosphere and ocean the specific linear variations of oscillation frequency with hysteresis–like jumps of frequency around tidal modes.
Keywords: gravity tide, day-to-day variations of geophysical parameters, spectral analysis
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