Forward modeling of gyrosynchrotron intensity perturbations by sausage modes

Reznikova, V. E., Antolin, Patrick and Van Doorsselaere, Tom (2014) Forward modeling of gyrosynchrotron intensity perturbations by sausage modes. The Astrophysical Journal, 785 (2). p. 86. ISSN 0004-637X

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Official URL: https://doi.org/10.1088/0004-637x/785/2/86

Abstract

To determine the observable radio signatures of the fast sausagestanding wave, we examine gyrosynchrotron (GS) emission modulation usinga linear three-dimensional magnetohydrodynamic model of a plasmacylinder. Effects of the line-of-sight angle and instrumental resolutionon perturbations of the GS intensity are analyzed for two models: a basemodel with strong Razin suppression and a low-density model in which theRazin effect was unimportant. Our finding contradicts previouspredictions made with simpler models: an in-phase variation of intensitybetween low (f peak) and high (f > fpeak) frequencies is found for the low-density model and ananti-phase variation for the base model in the case of a viewing angleof 45°. The spatially inhomogeneous character of the oscillatingemission source and the spatial resolution of the model are found tohave a significant effect on the resulting intensity.

Item Type: Article
Uncontrolled Keywords: Sun: flares, Sun: oscillations, Sun: radio radiation, Waves
Subjects: F300 Physics
F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 25 Oct 2019 13:51
Last Modified: 25 Oct 2019 14:00
URI: http://nrl.northumbria.ac.uk/id/eprint/41245

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