Generation of Type U Bursts in Solar Radio Emission

Details Generation of Type U Bursts in Solar Radio Emission Generation of Type U Bursts in Solar Radio Emission

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008soph..253..191l&link_type=abstract

Solar Physics, Volume 253, Issue 1-2, pp. 191-198

Physics

Solar Radio Emission, Electron Beam, Plasma Turbulence

Scientific paper

If plasma waves propagate in the direction of the plasma density decrease, their spectrum shifts to large wave numbers (to small phase velocities). This means that the spectrum of plasma waves excited by an electron beam concentrates near the distribution function (“plateau”) border, which shifts in the region of low velocities in the process of quasilinear relaxation. As the spectrum of excited plasma waves shifts in the region of large wave numbers, their frequency grows in accordance with the dispersion equation, which describes these waves. When the growth of the plasma wave frequency exceeds the decrease of the frequency owing to the regular inhomogeneity in the corona, the branch with positive frequency drift appears on the dynamic spectrum of the radio emission. Our computations allow us to estimate the density and energy of electron beams generating type U bursts.

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