Loss-Cone Instability and Formation of Zebra Patterns in Type IV Solar Radio Bursts |
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Authors: | A A Kuznetsov Yu T Tsap |
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Institution: | (1) Institute of Solar-Terrestrial Physics, Irkutsk, Russia;(2) Crimean Astrophysical Observatory, Nauchny Crimea, Ukraine |
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Abstract: | The loss-cone instability of energetic electrons at double plasma resonance is considered. Conditions required for the formation
of a zebra pattern in type IV solar radio bursts are determined. It is shown that electrons with a power-law energetic spectrum
can effectively excite upper-hybrid waves at double plasma resonance. Stripes of a zebra pattern become more pronounced with
an increase of the loss-cone opening angle and the power-law spectral index. The growth rate at the resonance frequencies
decreases with an increase of the cyclotron harmonic number. Interpretation of observations and diagnostics of plasma for
the April 21, 2002, event are performed. Conclusions about the impulsive mode of injection of energetic electrons into a coronal
arc are made. |
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Keywords: | Solar flares Radio emission Zebra pattern Loss-cone instability Double plasma resonance |
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