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Anomalous propagation of medium scale GWs along neutral winds
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SYSNO ASEP 0542504 Document Type A - Abstract R&D Document Type The record was not marked in the RIV R&D Document Type Není vybrán druh dokumentu Title Anomalous propagation of medium scale GWs along neutral winds Author(s) Rusz, Jan (UFA-U) ORCID, RID
Chum, Jaroslav (UFA-U) RID, ORCID
Baše, Jiří (UFA-U) RID, ORCIDNumber of authors 3 Source Title EGU General Assembly 2021 (vEGU21: Gather Online). - Göttingen : European Geosciences Union, 2021 Number of pages 1 s. Publication form Online - E Action EGU General Assembly Conference 2021 Event date 19.04.2021 - 30.04.2021 VEvent location online Country DE - Germany Event type WRD Language eng - English Country DE - Germany Keywords ionosphere ; thermosphere ; medium scale gravity waves ; neutral winds Subject RIV DG - Athmosphere Sciences, Meteorology OECD category Meteorology and atmospheric sciences Institutional support UFA-U - RVO:68378289 DOI https://doi.org/10.5194/egusphere-egu21-4250 Annotation Azimuth of medium scale gravity waves (GWs) propagation in the thermosphere/ionosphere fundamentally depends on the daytime and day of year. Previous studies show that the GWs mostly propagate against the predominant direction of neutral winds in the ionosphere. However, several cases of propagation along the wind direction have also been identified, specifically around the equinoxes. The analysis is based on remote observation of the ionosphere using multi–frequency and multipoint continuous Doppler sounding. The network consists of at least three spatially separated sounding paths (transmitter-receiver pairs) at three frequencies, situated in the western part of the Czech Republic. The apparent horizontal velocity and azimuth of GWs are derived from the time shifts observed for different measuring paths. The HWM14 neutral wind model is used for comparison of neutral winds with the observed phase speeds of GWs. Cases of anomalous propagation of GWs along the direction of neutral winds are analyzed. It is shown that the observed GW periods can be substantially shorter than the intrinsic periods in the wind-rest frame owing to Doppler shift. 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
Number of the records: 1