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Horizontal velocities and propagation directions of gravity waves in the ionosphere over the Czech Republic

SYSNO ASEP	0350501
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Horizontal velocities and propagation directions of gravity waves in the ionosphere over the Czech Republic
Author(s)	Chum, Jaroslav (UFA-U)_{RID, ORCID} Šindelářová, Tereza (UFA-U)_{RID, ORCID} Laštovička, Jan (UFA-U)_{RID, ORCID} Hruška, František (UFA-U)_RID Burešová, Dalia (UFA-U)_{RID, ORCID} Baše, Jiří (UFA-U)_{RID, ORCID}
Source Title	Journal of Geophysical Research - ISSN 0148-0227 Roč. 115, - (2010), A11322/1-A11322/13
Number of pages	13 s.
Language	eng - English
Country	US - United States
Keywords	Ionosphere ; gravity waves ; wave propagation ; remote sensing
Subject RIV	BL - Plasma and Gas Discharge Physics
R&D Projects	GA205/07/1367 GA ČR - Czech Science Foundation (CSF)
	GA205/09/1253 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z30420517 - UFA-U, BC-A (2005-2011)
UT WOS	000284708300005
DOI	10.1029/2010JA015821
Annotation	Using a five-point continuous Doppler sounding system operating at 3.59 MHz we investigate propagation directions and velocities of gravity waves (GWs) at altitudes from ~150 to ~250 km over the western part of the Czech Republic. The velocities and directions are computed from the time delays between the observations of corresponding GWs at different reflection points that correspond to various sounding paths. We focused on the GWs that produce an S-shaped trace in Doppler shift spectrograms and are observed close to sunrise and sunset. We have selected about 100 of such events. Our results show that the analyzed GWs propagate with typical horizontal velocities from ~100 to ~200 m/s. The north-south component of GW velocities depends on the season, it is directed northward in the summer and southward in the winter. At the same time, the north-south component of the neutral winds calculated by the horizontal wind model HWM07 has the opposite sign.
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	2011

Number of the records: 1