Magnetohydrodynamic Fast Sausage Waves in the Solar Corona

Li, B., Antolin, Patrick, Guo, M.-Z., Kuznetsov, A. A., Pascoe, D. J., Van Doorsselaere, T. and Vasheghani Farahani, S. (2020) Magnetohydrodynamic Fast Sausage Waves in the Solar Corona. Space Science Reviews, 216 (8). p. 136. ISSN 0038-6308

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Characterized by cyclic axisymmetric perturbations to both the magnetic and fluid parameters, magnetohydrodynamic fast sausage modes (FSMs) have proven useful for solar coronal seismology given their strong dispersion. This review starts by summarizing the dispersive properties of the FSMs in the canonical configuration where the equilibrium quantities are transversely structured in a step fashion. With this preparation we then review the recent theoretical studies on coronal FSMs, showing that the canonical dispersion features have been better understood physically, and further exploited seismologically. In addition, we show that departures from the canonical equilibrium configuration have led to qualitatively different dispersion features, thereby substantially broadening the range of observations that FSMs can be invoked to account for. We also summarize the advances in forward modeling studies, emphasizing the intricacies in interpreting observed oscillatory signals in terms of FSMs. All these advances notwithstanding, we offer a list of aspects that remain to be better addressed, with the physical connection of coronal FSMs to the quasi-periodic pulsations in solar flares particularly noteworthy.

Item Type: Article
Uncontrolled Keywords: Coronal seismology, Quasi-periodic pulsations, Sausage modes, Solar flares
Subjects: F300 Physics
F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 30 Mar 2021 12:53
Last Modified: 21 Nov 2021 03:30

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