Attenuation of electromagnetic waves at the frequency 1.7 kHz in the upper ionosphere observed by the DEMETER satellite in the vicinity of earthquakes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F12%3A00376939" target="_blank" >RIV/68378289:_____/12:00376939 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.annalsofgeophysics.eu/index.php/annals/article/view/5276" target="_blank" >http://www.annalsofgeophysics.eu/index.php/annals/article/view/5276</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4401/ag-5276" target="_blank" >10.4401/ag-5276</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Attenuation of electromagnetic waves at the frequency 1.7 kHz in the upper ionosphere observed by the DEMETER satellite in the vicinity of earthquakes

Popis výsledku v původním jazyce

The DEMETER satellite was the first satellite specifically dedicated to the recording of electromagnetic phenomena connected with seismic activity. Almost 6.5 years of measurements provide good opportunities to analyze a unique dataset with global Earthcoverage. We present the results of a statistical study of the intensity of very low frequency electromagnetic waves recorded in the upper ionosphere. For this study a robust two-step data processing has been used. We confirm the previously reported results of a very small, but statistically significant, decrease in VLF wave intensities a few hours before times of main shocks using this much larger dataset. The wave intensity decrease at a frequency of about 1.7 kHz is observed only during the night andonly for earthquakes with lower depth. This can be explained by increases in the cut-off frequency of the Earth ionosphere waveguide caused by imminent earthquakes.

Název v anglickém jazyce

Attenuation of electromagnetic waves at the frequency 1.7 kHz in the upper ionosphere observed by the DEMETER satellite in the vicinity of earthquakes

Popis výsledku anglicky

The DEMETER satellite was the first satellite specifically dedicated to the recording of electromagnetic phenomena connected with seismic activity. Almost 6.5 years of measurements provide good opportunities to analyze a unique dataset with global Earthcoverage. We present the results of a statistical study of the intensity of very low frequency electromagnetic waves recorded in the upper ionosphere. For this study a robust two-step data processing has been used. We confirm the previously reported results of a very small, but statistically significant, decrease in VLF wave intensities a few hours before times of main shocks using this much larger dataset. The wave intensity decrease at a frequency of about 1.7 kHz is observed only during the night andonly for earthquakes with lower depth. This can be explained by increases in the cut-off frequency of the Earth ionosphere waveguide caused by imminent earthquakes.

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

2012

Kód důvěrnosti údajů

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

Název periodika

Annals of Geophysics

ISSN

1593-5213

e-ISSN

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Svazek periodika

55

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

7

Strana od-do

157-163

Kód UT WoS článku

000306480400019

EID výsledku v databázi Scopus

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