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First observation of rising-tone magnetosonic waves
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SYSNO ASEP 0438269 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title First observation of rising-tone magnetosonic waves Author(s) Fu, H. S. (CN)
Cao, J. B. (CN)
Zhima, Z. (CN)
Khotyaintsev, Y. V. (SE)
Angelopoulos, V. (US)
Santolík, Ondřej (UFA-U) RID, ORCID
Omura, Y. (JP)
Taubenschuss, U. (SE)
Chen, L. (US)
Huang, S. Y. (CH)Source Title Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 41, č. 21 (2014), s. 7419-7426Number of pages 17 s. Language eng - English Country US - United States Keywords equatorial noise ; ring distributions ; cluster ; propagation ; emissions ; region ; themis ; chorus Subject RIV DG - Athmosphere Sciences, Meteorology R&D Projects 7E12026 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LH11122 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFA-U - RVO:68378289 UT WOS 000345518300002 EID SCOPUS 84912060870 DOI https://doi.org/10.1002/2014GL061867 Annotation Magnetosonic (MS) waves are linearly polarized emissions confined near the magnetic equator with wave normal angle near 90 degrees and frequency below the lower hybrid frequency. Such waves, also termed equatorial noise, were traditionally known to be "temporally continuous" in their time-frequency spectrogram. Here we show for the first time that MS waves actually have discrete wave elements with rising-tone features in their spectrogram. The frequency sweep rate of MS waves, similar to 1 Hz/s, is between that of chorus and electromagnetic ion cyclotron (EMIC) waves. For the two events we analyzed, MS waves occur outside the plasmapause and cannot penetrate into the plasmasphere; their power is smaller than that of chorus. We suggest that the rising-tone feature of MS waves is a consequence of nonlinear wave-particle interaction, as is the case with chorus and EMIC waves. 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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