Ray tracing study of rising tone EMIC-triggered emissions

0474211 - ÚFA 2018 DE eng A - Abstract
Hanzelka, Miroslav - Santolík, Ondřej - Grison, Benjamin - Cornilleau-Wehrlin, N.
Ray tracing study of rising tone EMIC-triggered emissions.
Geophysical Research Abstracts. Göttingen: European Geosciences Union, 2017. EGU2017-12065. ISSN 1607-7962.
[EGU General Assembly 2017. 23.04.2017-28.04.2017, Vienna]
Institutional support: RVO:68378289
Keywords : EMIC-triggered emissions * Cluster spacecraf * plasmapause * plasma waves
Subject RIV: BL - Plasma and Gas Discharge Physics
http://meetingorganizer.copernicus.org/EGU2017/EGU2017-12065.pdf

ElectroMagnetic Ion Cyclotron (EMIC) triggered emissions have been subject of extensive theoretical and experimental
research in last years. These emissions are characterized by high coherence values and a frequency range
of 0.5 - 2.0 Hz, close to local helium gyrofrequency. We perform ray tracing case studies of rising tone EMICtriggered
emissions observed by the Cluster spacecraft in both nightside and dayside regions off the equatorial
plane. By comparison of simulated and measured wave properties, namely wave vector orientation, group velocity,
dispersion and ellipticity of polarization, we determine possible source locations. Diffusive equilibrium density
model and other, semi-empirical models are used with ion composition inferred from cross-over frequencies. Ray
tracing simulations are done in cold plasma approximation with inclusion of Landau and cyclotron damping. Various
widths, locations and profiles of plasmapause are tested.
Permanent Link: http://hdl.handle.net/11104/0271330