Forward modeling of gyrosynchrotron intensity perturbations by sausage modes

V. E. Reznikova, Patrick Antolin, Tom Van Doorsselaere

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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.
Original languageEnglish
Article number86
JournalAstrophysical Journal
Volume785
Issue number2
DOIs
Publication statusPublished - 28 Mar 2014
Externally publishedYes

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