Modulation of the solar microwave emission by sausage oscillations

Abstract

The modulation of the microwave emission intensity from a flaring loop by a standing linear sausage fast magnetoacoustic wave is considered in terms of a straight plasma slab with the perpendicular Epstein profile of the plasma density, penetrated by a magnetic field. The emission is of the gyrosynchrotron (GS) nature, and is caused by mildly relativistic electrons which occupy a layer in the oscillating slab, i.e., the emitting and oscillating volumes do not coincide. It is shown that the microwave response to the linear sausage wave is highly non-linear. The degree of the non-linearity, defined as a ratio of the Fourier power of the second harmonic to the Fourier power of the principal harmonic, is found to depend on the combination of the width of the GS source and the viewing angle, and is different in the optically thick and optically thin parts of the microwave spectrum. This effect could be considered as a potential tool for diagnostics of the transverse scales of the regions filled in by the accelerated electrons.

8 pages, 5 figures

References in corpus (5)

• Above-the-loop-top Oscillation and Quasi-periodic Coronal Wave Generation in Solar Flares
• Magnetohydrodynamic Fast Sausage Waves in the Solar Corona
• Relationship of type III radio bursts with quasi-periodic pulsations in a solar flare
• Fast magnetoacoustic wave trains: from tadpoles to boomerangs
• Simulations of Gyrosynchrotron Microwave Emission from an Oscillating 3D Magnetic Loop

Cited by in corpus (3)

• Excitation of Multi-periodic Kink Motions in Solar Flare Loops: Possible Application to Quasi-periodic Pulsations
• Microwave response to kink oscillations of a plasma slab
• On collective nature of nonlinear torsional Alfvén waves