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Observations of the relationship between frequency sweep rates of chorus wave packets and plasma density
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SYSNO ASEP 0358096 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Observations of the relationship between frequency sweep rates of chorus wave packets and plasma density Author(s) Macúšová, Eva (UFA-U) RID
Santolík, Ondřej (UFA-U) RID, ORCID
Décréau, P. (FR)
Demekhov, A. G. (RU)
Nunn, D. (GB)
Gurnett, D. A. (US)
Pickett, J. S. (US)
Titova, E. E. (RU)
Kozelov, B. V. (RU)
Rauch, J. L. (FR)
Trotignon, J. G. (FR)Source Title Journal of Geophysical Research - ISSN 0148-0227
Roč. 115, - (2010), A12257/1-A12257/8Number of pages 8 s. Language eng - English Country US - United States Keywords Observations ; chorus ; plasma density ; Wideband (WBD) ; Cluster Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GAP205/10/2279 GA ČR - Czech Science Foundation (CSF) ME10001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000285839900001 DOI 10.1029/2010JA015468 Annotation Chorus emissions are generated by a nonlinear mechanism involving wave-particle interactions with energetic electrons. Discrete chorus wave packets are narrowband tones usually rising (sometimes falling) in frequency. We investigate frequency sweep rates of chorus wave packets measured by the Wideband data (WBD) instrument onboard the Cluster spacecraft. In particular, we study the relationship between the sweep rates and the plasma density measured by the WHISPER active sounder. We have observed increasing values of the sweep rate for decreasing plasma densities. We have compared our results with results of simulations of triggered emissions as well as with estimates based on the backward wave oscillator model for chorus emissions. We demonstrate a reasonable agreement of our experimental results with theoretical ones. 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 2011
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