Solar narrowband decimetric spike bursts and associated phenomena

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Decimeter Waves, Narrowband, Solar Radio Bursts, X Rays, Cyclotron Radiation, Electron Acceleration, Magnetic Field Reconnection, Relativistic Electron Beams, Solar Flares, Spikes, Surface Temperature

Scientific paper

A model of two acceleration regions during the impulsive phase of a solar flare is proposed, based on the observational data of solar narrowband spike bursts on November 12-14, 1981 (Enome et al., 1985). It is found that one region is formed in the current sheet by a magnetic reconnection process and the other is formed at the top of the flaring loop by turbulence acceleration. Using the formulas of a hollow beam electron cyclotron maser, the maximum growth rate of the second harmonic wave of the FX mode is evaluated. It is shown that, as the energy of the downward electron stream increases, the maximum growth rate, probability of spike emissions, relative bandwidth, and brightness temperature all increase, whereas the linear size of the spike source decreases and the peak flux remains fixed.

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