Radio emission from acceleration sites of solar flares

Abstract

The Letter takes up a question of what radio emission is produced by electrons at the very acceleration site of a solar flare. Specifically, we calculate incoherent radio emission produced within two competing acceleration models--stochastic acceleration by cascading MHD turbulence and regular acceleration in collapsing magnetic traps. Our analysis clearly demonstrates that the radio emission from the acceleration sites: (i) has sufficiently strong intensity to be observed by currently available radio instruments and (ii) has spectra and light curves which are distinctly different in these two competing models, which makes them observationally distinguishable. In particular, we suggest that some of the narrowband microwave and decimeter continuum bursts may be a signature of the stochastic acceleration in solar flares.

ApJL, in press

References in corpus (5)

• Observations of conduction driven evaporation in the early rise phase of solar flares
• Broadband Quasi-Periodic Radio and X-ray Pulsations in a Solar Flare
• Millisecond microwave spikes: statistical study and application for plasma diagnostics
• Particle acceleration by strong turbulence in solar flares: theory of spectrum evolution
• Do solar decimetric spikes originate in coronal X-ray sources?

Cited by in corpus (5)

• Cold, tenuous solar flare: acceleration without heating
• A Systematic Examination of Particle Motion in a Collapsing Magnetic Trap Model for Solar Flares
• Ultimate Fast Gyrosynchrotron Codes
• Location of Decimetric Pulsations in Solar Flares
• Probing Dynamics of Electron Acceleration with Radio and X-ray Spectroscopy, Imaging, and Timing in the 2002 Apr 11 Solar Flare