On the Envelope Soliton – Like Fine Structure in Solar Radio Emission |
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Authors: | DE-YU Wang GP Chernov VN Oraevsky |
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Institution: | (1) Purple Mountain Observatory, Nanjing, 210008, China;(2) National Astronomical Observatories, Chinese Academy of Sciences, China;(3) IZMIRAN, 142092, Troitsk, Moscow Region, Russia |
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Abstract: | Several quasi-periodic, milliseconds fine structures in the metric wave band occurring during the evolution of solar type
IV bursts have been observed by Yunnan Radio Telescope, Trieste Radio Telescope and IZMIRAN dynamic spectrometer. The envelope
of these quasi-period modulational fine structures have a soliton pattern, so it is called an envelope soliton-like fine structure.
A modulational instability model of electromagnetic wave has been adopted here. It is found that the longitudinal modulational
instability can occur only in the solar coronal region of low magnetic field and high temperature, as well as high density
plasma, which will give rise to the envelope soliton-like fine structures in the solar metric and decimetric radio emission.
The propagation effects of envelope soliton-like fine structure from corona to the observer on the Earth have been briefly
considered.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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