Nonlinear plasma wave processes observed in the polar cusp |
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| Authors: | Jan B??cki Roman Wronowski Michel Parrot Sergey P Savin |
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| Institution: | (1) Space Research Centre, Polish Academy of Sciences, Warszawa, Poland;(2) Laboratoire de Physique et Chimie de l’Environnement, CNRS, Orleans, France;(3) Space Research Institute, Russian Academy of Sciences, Moscow, Russia |
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| Abstract: | We present observations of electric and magnetic field variations from proton (about few Hz) to electron cyclotron frequencies
(about few kHz) obtained by STAFF instrument on Cluster satellites during two cusp crossings, at ∼6 R
E
altitude, in September 2002. The cusp was identified by the presence of intensive fluxes of counter streaming electrons with
low energies and broadband wave activity which is typical for this region.
Special attention is given for the interval of measurements when the waveform of the magnetic field fluctuations was taken
in this region by CLUSTER satellites. The wave has been processed using the wavelet and bispectral analysis. Results showing
the cascade of turbulence and wave-wave interactions are presented in this paper. A three wave process can be responsible
for the broadening of the wave spectra in the polar cusp. |
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| Keywords: | polar cusp three waves processes cascade of the energy wavelet analysis bispectral analysis |
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