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Abstract
A theoretical study is presented of the electrostatic electron cyclotron instability involving Bernstein modes in a magnetized plasma. The presence of a tenuous thermal ring distribution in a Maxwellian plasma decreases the frequency of the upper hybrid branch of the electron Bernstein mode until it merges with the nearest lower branch with a resulting instability. The instability occurs when the upper hybrid frequency is somewhat above the third, fourth, and higher electron cyclotron harmonics, and gives rise to a narrow spectrum of waves around the electron cyclotron harmonic nearest to the upper hybrid frequency. For a tenuous cold ring distribution together with a Maxwellian distribution an instability can take place also near the second electron cyclotron harmonic. Noisefree Vlasov simulations are used to assess the theoretical linear growthrates and frequency spectra, and to study the nonlinear evolution of the instability. The relevance of the results to laboratory and ionospheric heating experiments is discussed.
Original language  English 

Article number  095002 
Number of pages  10 
Journal  Plasma Physics and Controlled Fusion 
Volume  58 
Issue number  9 
DOIs  
Publication status  Published  27 Jul 2016 
Keywords
 electrostatic electron cyclotron instability
 thermal ring distribution
 deltafunction ring distribution
 bernstein modes
 Maxwellian distribution
 ionospheric heating
 magnetized plasmas
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 1 Finished

MultiScale Numerical Modelling of Magnetised Plasma Turbulence
Eliasson, B., Phelps, A. & Ronald, K.
EPSRC (Engineering and Physical Sciences Research Council)
26/01/15 → 25/07/18
Project: Research
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Electrostatic electron cyclotron instabilities near the upper hybrid layer due to electron ring distributions
Eliasson, B. (Creator), Speirs, D. (Creator) & Daldorff, L. K. S. (Contributor), University of Strathclyde, 23 May 2015
DOI: 10.15129/56448d9eadb04d2bafdb029165a40f54
Dataset