Dependence of the Sweep Rate of Whistler-mode Chorus Emissions on the Plasma Density

0396653 - ÚFA 2014 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Macúšová, Eva - Santolík, Ondřej - Gurnett, D. A. - Pickett, J. S. - Nunn, D. - Trakhtengerts, V. Y. - Demekhov, A. G. - Titova, E. E. - Kozelov, V. - Rycroft, M. J.
Dependence of the Sweep Rate of Whistler-mode Chorus Emissions on the Plasma Density.
WDS’07 Proceedings of contributed paper, Part II - Physics of Plasmas and Ionized Media. Prague: MATFYZPRESS, 2007 - (Šafránková, J.; Pavlů, J.), s. 71-80. ISBN 978-80-7378-024-1.
[Week of Doctoral Students 2007. Praha (CZ), 05.06.2007-08.06.2007]
Grant CEP: GA ČR GA205/03/0953
Grant ostatní: ESA(XE) PECS No. 98025
Výzkumný záměr: CEZ:AV0Z30420517
Klíčová slova: Chorus Emissions
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
http://www.mff.cuni.cz/veda/konference/wds/proc/proc-contents.php?year=2007

Whistler-mode chorus consists of intense electromagnetic wave packets generated by a nonlinear mechanism involving wave-particle interactions. Chorus wave packets are discrete frequency-time structures in a frequency range from a few hundreds of Hz to several kHz changing their frequency on a time scale from a few tenths of seconds to a few seconds. The source region of chorus emissions is localised close to the geomagnetic equatorial plane. Our investigation is based on multipoint measurements of the wideband (WBD) plasma wave instruments on board the four Cluster spacecraft. We investigate the sweep rate of the chorus frequency as a Whistler-mode chorus consists of intense electromagnetic wave packets generated by a nonlinear mechanism involving wave-particle interactions. Chorus wave packets are discrete frequency-time structures in a frequency range from a few hundreds of Hz to several kHz changing their frequency on a time scale from a few tenths of seconds to a few seconds. The source region of chorus emissions is localised close to the geomagnetic equatorial plane. Our investigation is based on multipoint measurements of the wideband (WBD) plasma wave instruments on board the four Cluster spacecraft. We investigate the sweep rate of the chorus frequency as a function of the cold plasma density in the equatorial plane and then we compare it A theoretical model, numerical simulations and also our preliminary results from the measurements predict an increasing sweep rate with decreasing cold plasma density.
Trvalý link: http://hdl.handle.net/11104/0224395