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American Astronomical Society, Astrophysical Journal, 2(785), p. 86, 2014

DOI: 10.1088/0004-637x/785/2/86

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Forward modeling of gyrosynchrotron intensity perturbations by sausage modes

Journal article published in 2014 by V. E. Reznikova ORCID, P. Antolin, T. Van Doorsselaere ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

To determine the observable radio signatures of the fast sausage standing wave, we examine gyrosynchrotron (GS) emission modulation using a linear three-dimensional magnetohydrodynamic model of a plasma cylinder. Effects of the line-of-sight angle and instrumental resolution on perturbations of the GS intensity are analyzed for two models: a base model with strong Razin suppression and a low-density model in which the Razin effect was unimportant. Our finding contradicts previous predictions made with simpler models: an in-phase variation of intensity between low (f < f peak) and high (f > f peak) frequencies is found for the low-density model and an anti-phase variation for the base model in the case of a viewing angle of 45°. The spatially inhomogeneous character of the oscillating emission source and the spatial resolution of the model are found to have a significant effect on the resulting intensity.