  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.
