Frequencies of wave packets of whistler-mode chorus inside its source region: a case study

0313217 - ÚFA 2009 RIV US eng J - Journal Article
Santolík, Ondřej - Macúšová, Eva - Titova, E. E. - Kozelov, B. V. - Gurnett, D. A. - Pickett, J. S. - Trakhtengerts, V. Y. - Demekhov, A. G.
Frequencies of wave packets of whistler-mode chorus inside its source region: a case study.
[Frekvence vlnových balíků emisí typu chorus uvnitř zdrojové oblasti: případová studie.]
Annales Geophysicae. Roč. 26, č. 6 (2008), s. 1665-1670. ISSN 0992-7689. E-ISSN 1432-0576
R&D Projects: GA AV ČR IAA301120601
Institutional research plan: CEZ:AV0Z30420517
Keywords : chorus emissions * chorus source region * magnetospheric physics * radio science * space plasma physics
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 1.660, year: 2008
http://www.ann-geophys.net/26/1665/2008/

Whistler-mode chorus is a structured wave emission observed in the Earth’s magnetosphere in a frequency range from a few hundreds of Hz to several kHz. We investigate wave packets of chorus using high-resolution measurements recorded by the WBD instrument on board the four Cluster spacecraft. A night-side chorus event observed during geomagnetically disturbed conditions is analyzed. We identify lower and upper frequencies for a large number of individual chorus wave packets inside the chorus source region. We investigate how these observations are related to the central position of the chorus source which has been previously estimated from the Poynting flux measurements. We observe typical frequency bandwidths of chorus of approximately 10% of the local electron cyclotron frequency. Observed time scales are around 0.1 s for the individual wave packets. Our results indicate a lower occurrence probability for lower frequencies in the vicinity of the central position of the source.

Detailní případová studie emise typu chorus z dat družic Cluster.
Permanent Link: http://hdl.handle.net/11104/0164102