Název: Dependence of the Sweep Rate of Whistler-mode Chorus Emissions on the Plasma Density
Autoři: 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.
Typ dokumentu: Příspěvky z konference
Konference/Akce: Week of Doctoral Students 2007, Praha (CZ), 2007-06-05 / 2007-06-08
Rok: 2007
Jazyk: eng
Abstrakt: 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.
Klíčová slova: Chorus Emissions
Číslo projektu: CEZ:AV0Z30420517 (CEP), GA205/03/0953 (CEP), PECS No. 98025
Poskytovatel projektu: GA ČR, ESA
Zdrojový dokument: WDS’07 Proceedings of contributed paper, Part II - Physics of Plasmas and Ionized Media, ISBN 978-80-7378-024-1
Poznámka: Související webová stránka: http://www.mff.cuni.cz/veda/konference/wds/proc/proc-contents.php?year=2007

Instituce: Ústav fyziky atmosféry AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0224395

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-156616


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav fyziky atmosféry
Konferenční materiály > Příspěvky z konference