Oblique propagation of whistler mode waves in the chorus source region

0348650 - ÚFA 2011 RIV US eng J - Journal Article
Santolík, Ondřej - Gurnett, D. A. - Pickett, J. S. - Chum, Jaroslav - Cornilleau-Wehrlin, N.
Oblique propagation of whistler mode waves in the chorus source region.
Journal of Geophysical Research. Roč. 114, - (2009), A00F03/1-A00F03/12. ISSN 0148-0227
R&D Projects: GA AV ČR IAA301120601
Grant - others:GA MŠk(CZ) ME 842
Institutional research plan: CEZ:AV0Z30420517
Keywords : STORM-TIME CHORUS * MAGNETOSPHERIC CHORUS * MAGNETIC-FIELD * OUTER MAGNETOSPHERE * POLARIZATION STATES * OSCILLATOR MODEL * VLF WAVES * EMISSIONS * HISS * CLUSTER
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 3.082, year: 2009

Whistler mode chorus has been shown to play a role in the process of local acceleration of electrons in the outer Van Allen radiation belt. Most of the quasi-linear and nonlinear theoretical studies assume that the waves propagate parallel to the terrestrial magnetic field. We show a case where this assumption is invalid. We use data from the Cluster spacecraft to characterize propagation and spectral properties of chorus. The recorded high-resolution waveforms show that chorus in the source region can be formed by a succession of discrete wave packets with decreasing frequency that sometimes change into shapeless hiss. These changes occur at the same time in the entire source region. Multicomponent measurements show that waves in both these regimes can be found at large angles to the terrestrial magnetic field.
Permanent Link: http://hdl.handle.net/11104/0189108