Zvláštní přechodné jevy pozorované Dopplerovskými měřeními na časových škálách infrazvuku

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F08%3A00306521" target="_blank" >RIV/68378289:_____/08:00306521 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Peculiar transient phenomena observed by HF Doppler sounding on infrasound time scales

Popis výsledku v původním jazyce

Compared to investigations of the influence of gravity and planetary waves on the ionosphere, the effects of infrasound variations have not been studied very much in the last 20 years. Here we present some recent results on peculiar transient phenomena occurring at infrasound timescales, as observed by HF Doppler sounding. First, we present examples of S-shaped traces. We show that S-shape phenomena appear to be concentrated near sunset and sunrise. We also discuss their relationship to gravity and infrasound waves. Then we show rare patterns with Doppler shifts corresponding to quasi-linear shape (QLS) phenomena in the time?frequency space. Their slope may be positive or negative. We discuss the possible origin of such a phenomenon. Several potentialsources of QLSs were excluded, such as aircrafts, satellites, bolides, meteors, meteorites, thunderstorms or geomagnetic storms. We speculate that QLSs may correspond to the radio waves in the Z-mode reflected at the upper hybrid resonanc

Název v anglickém jazyce

Peculiar transient phenomena observed by HF Doppler sounding on infrasound time scales

Popis výsledku anglicky

Compared to investigations of the influence of gravity and planetary waves on the ionosphere, the effects of infrasound variations have not been studied very much in the last 20 years. Here we present some recent results on peculiar transient phenomena occurring at infrasound timescales, as observed by HF Doppler sounding. First, we present examples of S-shaped traces. We show that S-shape phenomena appear to be concentrated near sunset and sunrise. We also discuss their relationship to gravity and infrasound waves. Then we show rare patterns with Doppler shifts corresponding to quasi-linear shape (QLS) phenomena in the time?frequency space. Their slope may be positive or negative. We discuss the possible origin of such a phenomenon. Several potentialsources of QLSs were excluded, such as aircrafts, satellites, bolides, meteors, meteorites, thunderstorms or geomagnetic storms. We speculate that QLSs may correspond to the radio waves in the Z-mode reflected at the upper hybrid resonanc

Druh

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

CEP obor

DG - Vědy o atmosféře, meteorologie

OECD FORD obor

—

Projekt

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

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2008

Kód důvěrnosti údajů

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

Název periodika

Journal of Atmospheric and Solar-Terrestrial Physics

ISSN

1364-6826

e-ISSN

—

Svazek periodika

70

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

866-878

Kód UT WoS článku

—

EID výsledku v databázi Scopus

—