Oscillations in the photosphere of a sunspot umbra from the inversion of infrared Stokes profiles

被引：74
|
作者：
Rubio, LRB [1 ]
Collados, M [1 ]
Cobo, BR [1 ]
Hidalgo, IR [1 ]
机构：
[1] Inst Astrofis Canarias, E-38200 San Cristobal la Laguna, Tenerife, Spain
来源：
ASTROPHYSICAL JOURNAL | 2000年 / 534卷 / 02期
关键词：
Sun : magnetic fields; Sun : oscillations; Sun : photosphere; sunspots;
D O I：
10.1086/308791
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report on the detection of magnetic field strength and velocity oscillations in the photosphere of a sunspot umbra. Our analysis is based on the inversion of the full Stokes vector of three Fe I lines at 15650 Angstrom from which the stratification with optical depth of the different atmospheric parameters has been derived. This allows us to estimate the amplitude of the oscillations and the phase lag between the fluctuations in the line-of-sight velocity and field strength. Our results suggest that the inferred magnetic field oscillations are caused by opacity fluctuations that move upward and downward the region where the spectral lines are sensitive to magnetic fields.
引用
收藏
页码：989 / 996
页数：8
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