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Effect of a sausage oscillation on radio zebra pattern structures in a solar flare
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Yu, Sijie, Nakariakov, V. M. (Valery M.) and Yan, Yihua (2016) Effect of a sausage oscillation on radio zebra pattern structures in a solar flare. Astrophysical Journal, 826 (1). ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.3847/0004-637X/826/1/78
Abstract
Sausage modes that are axisymmetric fast magnetoacoustic oscillations of solar coronal loops are characterized by variation of the plasma density and magnetic field, and hence cause time variations of the electron plasma frequency and cyclotron frequency. The latter parameters determine the condition for the double plasma resonance (DPR), which is responsible for the appearance of zebra-pattern (ZP) structures in time spectra of solar type IV radio bursts. We perform numerical simulations of standing and propagating sausage oscillations in a coronal loop modeled as a straight, field-aligned plasma slab, and determine the time variation of the DPR layer locations. Instant values of the plasma density and magnetic field at the DPR layers allowed us to construct skeletons of the time variation of ZP stripes in radio spectra. In the presence of a sausage oscillation, the ZP structures are shown to have characteristic wiggles with the time period prescribed by the sausage oscillation. Standing and propagating sausage oscillations are found to have different signatures in ZP patterns. We conclude that ZP wiggles can be used for the detection of short-period sausage oscillations and the exploitation of their seismological potential.
| Item Type: | Journal Article | ||||||||
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Journal or Publication Title: | Astrophysical Journal | ||||||||
| Publisher: | IOP Publishing | ||||||||
| ISSN: | 0004-637X | ||||||||
| Official Date: | 25 July 2016 | ||||||||
| Dates: |
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| Volume: | 826 | ||||||||
| Number: | 1 | ||||||||
| Number of Pages: | 9 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Date of first compliant deposit: | 23 May 2016 | ||||||||
| Date of first compliant Open Access: | 2 September 2016 | ||||||||
| Is Part Of: | Marie Curie PIRSES-GA-2011-295272 RadioSun project, the European Research Council under the SeismoSun Research Project No. 321141, STFC consolidated grant ST/L000733/1. ORCID: 0000-0001-6423-8286 |
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