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RADIO PULSATIONS AND ZEBRA PATTERN IN THE BROAD FREQUENCY RANGE
Chernov G.P., Yan Y., Fu Q., Tan Ch.,
Zebra structure (ZS) in the continuous emission of type IV solar radio bursts is frequently observed simultaneously with the second pulsations. In the meter wave band pulsations resemble greatly periodic type III radio bursts against the background of flare continuum, after type II radio burst. In this case fast electrons, responsible for ZS, can be connected only indirectly with the electrons, responsible for type III bursts, when particles can be trapped, for example, between the shock front and the forward edge of CME. In the decimeter range ZS is more frequently observed in the LF part of the spectrum of pulsations, when the same particles can be captured into the magnetic trap, at the top of which the conditions for the excitation of ZS realize. In cm wave band ZS appears frequently against the background of pulsations in any part of the spectrum. This testifies about the fact that the same rapid particles are responsible for both types of fine structure, and the excitation of ZS is connected with the deformation of the distribution function as a result of the quasi-linear diffusion of generated waves on fast particles. Observations of ZS are usually limited from the high frequencies (near 5500 MHz) due to the bremsstrahlung absorption of the upper-hybrid plasma waves emission in the background plasma. In the event April 21, 2002 about 35 stripes of ZS of almost identical intensity were observed in the range 2,6-3,8 MHz with a hardly noticeable increase in the frequency separation with frequency. This large number of stripes is difficult to match with the emission mechanism at the double plasma resonance from a distributed radio source but it is possible to reconcile with the new mechanism of a trapping of Z- mode in density enhancements and the emission at eigenfrequencies from a point source by analogy with the mechanism of the auroral roar emission in the terrestrial ionosphere (LaBelle, Treumann, Yoon, Karlicky, 2003, Ap. J., 593, 1195).