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Millisecond solar radio spikes
Currently available models of one of the most intriguing types of nonstationary
solar radio emission, millisecond solar radio spikes, are discussed. A
comparative analysis of the model implications and the existing observational
data (concerning temporal, spectral, spatial, polarization, and other properties)
yields the outline of what appears to be the most realistic radio spike
model. This outline is as follows.The spikes are produced by the electron
cyclotron maser mechanism. The cyclotron loss-cone instability is caused
by fast electrons distributed over energies according to a (broken) power
law. The angular part of the distribution function (whose exact form is,
as yet, undetermined) suffers fluctuations due to the magnetic field inhomogeneities
that arise in the flare loop as a consequence of the primary energy release.
In some regions of the loop the distribution is anisotropic enough to produce
the electron cyclotron instability; it is that `micro-traps' where individual
spikes form. Key problems and areas of future theoretical and experimental
research are suggested and discussed.
Authors: G.D.Fleishman & V.F.Melnikov
Above is background material for archival reference only.