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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F10%3A00350501" target="_blank" >RIV/68378289:_____/10:00350501 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 isdirected 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 isdirected 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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Geophysical Research

ISSN

0148-0227

e-ISSN

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Svazek periodika

115

Číslo periodika v rámci svazku

-

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

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Kód UT WoS článku

000284708300005

EID výsledku v databázi Scopus

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