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Infrasonic waves in the ionosphere generated by a weak earthquake
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SYSNO ASEP 0367508 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Infrasonic waves in the ionosphere generated by a weak earthquake Author(s) Krasnov, V. M. (RU)
Drobzheva, Ya. V. (RU)
Chum, Jaroslav (UFA-U) RID, ORCIDSource Title Journal of Atmospheric and Solar-Terrestrial Physics. - : Elsevier - ISSN 1364-6826
Roč. 73, č. 13 (2011), s. 1930-1939Number of pages 10 s. Language eng - English Country GB - United Kingdom Keywords Earthquake ; Infrasonic waves ; Ionospheric disturbances 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 000294591800037 DOI 10.1016/j.jastp.2011.05.002 Annotation A computer code has been developed to simulate the generation of infrasonic waves (frequencies considered <= 80 Hz) by a weak earthquake (magnitude similar to 3.6), their propagation through the atmosphere and their effects in the ionosphere. We provide estimates of the perturbations in the ionosphere at the height (similar to 160 km) where waves at the sounding frequency (3.59 MHz) of a continuous Doppler radar reflect. We have found that the pressure perturbation is 5.79 x 10(-7) Pa (0.26% of the ambient value), the temperature perturbation is 0.088 K (0.015% of the ambient value) and the electron density perturbation is 2 x 10(8) m(-3) (0.12% of the ambient value). The characteristic perturbation is found to be a bipolar pulse lasting similar to 25 s, and the maximum Doppler shift is found to be similar to 0.08 Hz, which is too small to be detected by the Doppler radar at the time of the earthquake. 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 2012 Electronic address http://www.sciencedirect.com/science/article/pii/S1364682611001374
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