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Alternative zebra-structure models in solar radio emission by Chernov G.P.

2 Oct 2018, 09:37 UTC
Alternative zebra-structure models in solar radio emission by Chernov G.P.
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There is ongoing discussion in the literature about the nature of zebra-structure (ZS) in type IV radio bursts (Chernov, 2011). We showed the possibility of a model with whistler waves to explain many thin components of ZS stripes, taking into account the effects of scattering of the whistlers on fast particles. Here, we show some complex examples of observations of ZS bursts in different wave ranges, which are difficult to interpret within the framework of the Double Plasma Resonance (DPR) mechanism. Then we pass directly to theoretical problems.
Figure 1. This dynamic spectrum shows the evolution of zebra-type bursts during 46 s, observed on 2004, December 1 with the Huairou radio station (Beijing). Initial fiber-type bursts transform into zebra patterns, as well as into decimetric millisecond spikes (from Chernov et al. 2017, Geo. and Aer. 57, 738).
In the DPR model all the changes of ZS stripes are usually associated with changes of the magnetic field and with propagating fast magneto-acoustic waves. In a very complicated case the simultaneous presence of fast particles in a radio source with several different distribution functions was proposed (Zheleznyakov et al. 2016). However, the DPR conditions cannot change up to ten times per second ...

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