Observation of quasi-periodic frequency sweeping in electron cyclotron   emission of nonequilibrium mirror-confined plasma
  Chirping frequency patterns have been observed in the electron cyclotron emission from strongly nonequilibrium plasma confined in a table-top mirror magnetic trap. Such patterns are typical for the formation of nonlinear phase space structures in a proximity of the wave-particle resonances of a kinetically unstable plasma, also known as the "holes and clumps" mechanism. Our data provides the first experimental evidence for acting of this mechanism in the electron cyclotron frequency domain. 
M. E. Viktorov, A. G. Shalashov, D. A. Mansfeld and S. V. Golubev   (Institute of Applied Physics of Russian Academy of Scie...
physics.plasm-ph