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Electromagnetic ion cyclotron waves in the helium branch induced by multiple electromagnetic ion cyclotron triggered emissions
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SYSNO ASEP 0367472 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Electromagnetic ion cyclotron waves in the helium branch induced by multiple electromagnetic ion cyclotron triggered emissions Author(s) Shoji, M. (JP)
Omura, Y. (JP)
Grison, Benjamin (UFA-U) RID, ORCID
Pickett, J. (US)
Dandouras, I. (FR)
Engebretson, M. (US)Source Title Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 38, - (2011), L17102/1-L17102/5Number of pages 5 s. Language eng - English Country US - United States Keywords 1-2 MAGNETIC PULSATIONS ; EQUATORIAL MAGNETOSPHERE ; DISTRIBUTIONS ; STORMS Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GPP209/11/P848 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000294620200003 DOI 10.1029/2011GL048427 Annotation Electromagnetic ion cyclotron (EMIC) triggered emissions with rising tones between the H(+) and He(+) cyclotron frequencies were found in the inner magnetosphere by the recent Cluster observations. Another type of EMIC wave with a constant frequency is occasionally observed below the He(+) cyclotron frequency after the multiple EMIC triggered emissions. We performed a self-consistent hybrid simulation with a one-dimensional cylindrical magnetic flux model approximating the dipole magnetic field of the Earth's inner magnetosphere. In the presence of energetic protons with a sufficient density and temperature anisotropy, multiple EMIC triggered emissions are reproduced due to the nonlinear wave growth mechanism of rising-tone chorus emissions, and a constant frequency wave in the He(+) EMIC branch is subsequently generated. Through interaction with the multiple EMIC rising-tone emissions, the velocity distribution function of the energetic protons is strongly modified. 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.agu.org/pubs/crossref/2011/2011GL048427.shtml
Number of the records: 1