期刊
ASTROPHYSICAL JOURNAL
卷 827, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/0004-637X/827/1/37
关键词
hydrodynamics; methods: numerical; Sun: atmosphere; waves
资金
- Polish National Foundation (NCN) Grant [2014/15/B/ST9/00106]
- NSF [AGS 1246074]
- Alexander von Humboldt Foundation
- German Academic Exchange Service DAAD
- Solarnet project from European Commission FP7 Capacities Programme [312495]
Recently Wisniewska et al. demonstrated observationally how the acoustic cutoff frequency varies with height in the solar atmosphere including the upper photosphere and the lower and middle chromosphere, and showed that the observational results cannot be accounted for by the existing theoretical formulas for the acoustic cutoff. In order to reproduce the observed variation of the cutoff with atmospheric height, numerical simulations of impulsively generated acoustic waves in the solar atmosphere are performed, and the spectral analysis of temporal wave profiles is used to compute numerically changes of the acoustic cutoff with height. Comparison of the numerical results with the observational data shows good agreement, which clearly indicates that the obtained results may be used to determine the structure of the background solar atmosphere.
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