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Statistical investigation of gravity wave characteristics in the ionosphere
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SYSNO ASEP 0540569 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Statistical investigation of gravity wave characteristics in the ionosphere Author(s) Chum, Jaroslav (UFA-U) RID, ORCID
Podolská, Kateřina (UFA-U) RID, ORCID
Rusz, Jan (UFA-U) ORCID, RID
Baše, Jiří (UFA-U) RID, ORCID
Tedoradze, Nikolai (UFA-U) RID, ORCIDNumber of authors 5 Article number 60 Source Title Earth, Planets and Space. - : Springer
Roč. 73, č. 1 (2021)Number of pages 16 s. Language eng - English Country DE - Germany Keywords Travelling ionospheric disturbances ; Gravity waves ; 3D propagation analysis ; Elevation angles of wave vectors ; Attenuation of gravity waves ; Neutral winds ; Wind rest-frame velocities Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA18-01969S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFA-U - RVO:68378289 UT WOS 000625387100001 EID SCOPUS 85102078925 DOI 10.1186/s40623-021-01379-3 Annotation Propagation of medium-scale gravity waves (GWs) in the thermosphere/ionosphere is observed remotely, using multi-frequency and multi-point continuous Doppler sounding system located in the western part of Czechia. Reflection heights of the sounding radio waves are determined from a nearby ionosonde. Phase velocity vectors of GWs are calculated from time/phase delays between signals corresponding to different transmitter–receiver pairs that reflect in the ionosphere at different locations. As various frequencies reflect at different heights, reflection points of radio signals are separated both horizontally and vertically, and the investigation of GW propagation in the ionosphere is performed in three dimensions. Results obtained for two 1-year periods representing the solar maximum (July 2014–June 2015) and current solar minimum (September 2018–August 2019) are presented. It is shown that GWs in the ionosphere usually propagated with wave vectors directed obliquely downward. A statistical distribution of wave vector elevation angles is presented. A model of neutral winds is used to estimate the wave characteristics in the wind-rest frame. It is found that the distribution of elevation angles is narrower in the wind-rest frame than in the Earth frame. Seasonal and diurnal changes of propagation directions and attenuations of GWs are discussed. The wind-rest frame wavelengths of the analyzed GWs were usually from ~ 80 to 300 km, and the propagation velocities were mostly between ~ 100 and ~ 220 m/s. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2022 Electronic address https://earth-planets-space.springeropen.com/articles/10.1186/s40623-021-01379-3
Number of the records: 1