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Statistical investigation of VLF quasiperiodic emissions measured by the DEMETER spacecraft
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SYSNO ASEP 0436387 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Statistical investigation of VLF quasiperiodic emissions measured by the DEMETER spacecraft Author(s) Hayosh, Mykhaylo (UFA-U) RID, ORCID
Němec, F. (CZ)
Santolík, Ondřej (UFA-U) RID, ORCID
Parrot, M. (FR)Source Title Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 119, č. 10 (2014), s. 8063-8072Number of pages 10 s. Publication form Print - P Language eng - English Country US - United States Keywords VLF waves in ionosphere ; QP emissions ; DEMETER spacecraft Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GAP209/11/2280 GA ČR - Czech Science Foundation (CSF) LH12231 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFA-U - RVO:68378289 UT WOS 000345445400007 DOI 10.1002/2013JA019731 Annotation We present a survey of quasiperiodic (QP) ELF/VLF emissions detected onboard the DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) satellite (altitude of about 700 km, nearly Sun-synchronous orbit at 10:30/22:30 LT). Six years of data have been visually inspected for the presence of QP emissions with modulation periods higher than 10 s and with frequency bandwidths higher than 200 Hz. It is found that these QP events occur in about 5% of daytime half orbits, while they are basically absent during the night. The events occur predominantly during quiet geomagnetic conditions following the periods of enhanced geomagnetic activity. Their occurrence and properties are systematically analyzed. QP emissions occur most often at frequencies from about 750 Hz to 2 kHz, but they may be observed at frequencies as low as 500 Hz and as high as 8 kHz. Modulation periods of QP events may range from about 10 to 100 s, with typical values of 20 s. Frequency drifts of the identified events are generally positive, but they are lower for events with larger modulation periods. The events are usually limited to higher L values (L > 2). 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 2015
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