Počet záznamů: 1
Horizontal velocities and propagation directions of gravity waves in the ionosphere over the Czech Republic
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SYSNO ASEP 0350501 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Horizontal velocities and propagation directions of gravity waves in the ionosphere over the Czech Republic Tvůrce(i) 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, ORCIDZdroj.dok. Journal of Geophysical Research - ISSN 0148-0227
Roč. 115, - (2010), A11322/1-A11322/13Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova Ionosphere ; gravity waves ; wave propagation ; remote sensing Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech CEP GA205/07/1367 GA ČR - Grantová agentura ČR GA205/09/1253 GA ČR - Grantová agentura ČR CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000284708300005 DOI 10.1029/2010JA015821 Anotace 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. Pracoviště Ústav fyziky atmosféry Kontakt Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Rok sběru 2011
Počet záznamů: 1