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Impulsively Generated Wave Trains in Coronal Structures. I. Effects of Transverse Structuring on Sausage Waves in Pressureless Tubes
Yu, Hui; Li, Bo; Chen, Shao-Xia; Xiong, Ming; Guo, Ming-Zhe
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2017
Volume836Issue:1Pages:1
ISSN0004-637X
Language英语
KeywordMagnetohydrodynamics (Mhd) Sun: Corona Sun: Flares Sun: Magnetic Fields Waves
AbstractThe behavior of the axial group speeds of trapped sausage modes plays an important role in determining impulsively generated wave trains, which have often been invoked to account for quasi-periodic signals with quasi-periods of the. order of seconds in a considerable number of coronal structures. We conduct a comprehensive eigenmode analysis, both analytically and numerically, on the dispersive properties of sausage modes in pressureless tubes with three families of continuous radial density profiles. We find a rich variety of the dependence on the axial wavenumber k of the axial group speed v(gr). Depending on the density contrast and profile steepness as well as on the detailed profile description, the v(gr)-k curves either possess or do not possess cutoff wavenumbers, and they can behave in either a monotonical or non-monotonical manner. With time-dependent simulations, we further show that this rich variety of the group speed characteristics heavily influences the temporal evolution and Morlet spectra of impulsively generated wave trains. In particular, the Morlet spectra can look substantially different from the "crazy tadpoles" found for the much-studied discontinuous density profiles. We conclude that it is necessary to re-examine available high-cadence data to look for the rich set of temporal and spectral features that can be employed to discriminate between the unknown forms of the density distributions transverse to coronal structures.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5815
Collection空间科学部
Recommended Citation
GB/T 7714
Yu, Hui,Li, Bo,Chen, Shao-Xia,et al. Impulsively Generated Wave Trains in Coronal Structures. I. Effects of Transverse Structuring on Sausage Waves in Pressureless Tubes[J]. ASTROPHYSICAL JOURNAL,2017,836(1):1.
APA Yu, Hui,Li, Bo,Chen, Shao-Xia,Xiong, Ming,&Guo, Ming-Zhe.(2017).Impulsively Generated Wave Trains in Coronal Structures. I. Effects of Transverse Structuring on Sausage Waves in Pressureless Tubes.ASTROPHYSICAL JOURNAL,836(1),1.
MLA Yu, Hui,et al."Impulsively Generated Wave Trains in Coronal Structures. I. Effects of Transverse Structuring on Sausage Waves in Pressureless Tubes".ASTROPHYSICAL JOURNAL 836.1(2017):1.
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