Oscillations in the wings of sunspot transition region lines

被引:24
作者
Brynildsen, N
Maltby, P
Kjeldseth-Moe, O
Wilhelm, K
机构
[1] Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway
[2] Max Planck Inst Aeron, D-37191 Katlenburg Lindau, Germany
关键词
Sun : sunspot oscillations; Sun : transition region; EUV radiation; line wing;
D O I
10.1051/0004-6361:20021848
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We explore a new approach to the investigation of optically thin emission lines by comparing the intensity variations in opposite wings of the spectral lines and apply the method to investigate the oscillations above sunspots. The observations show that it is easier to detect the 3 min oscillations above sunspots in the short wavelength ("blue") wing than in the long wavelength ("red") wing of the lines. The observed oscillations are compatible with the spectral line signatures of upwardly propagating acoustic waves.
引用
收藏
页码:L15 / L18
页数:4
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