Signatures of very long period waves in the polar coronal holes

被引：41
|
作者：
Banerjee, D
O'Shea, E
Doyle, JG
Goossens, M
机构：
[1] Katholieke Univ Leuven, Ctr Plasma Astrophys, B-3001 Heverlee, Belgium
[2] ESA, Dept Space Sci, ESTEC, Solar Syst Div, NL-2201 AZ Noordwijk, Netherlands
[3] Armagh Observ, Armagh BT61 9DG, North Ireland
来源：
ASTRONOMY & ASTROPHYSICS | 2001年 / 380卷 / 02期
关键词：
Sun : polar coronal holes; ultraviolet : SoHO; Sun : oscillations;
D O I：
10.1051/0004-6361:20011548
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We examine long spectral time series of a coronal hole observed on the 7th March 2000 with the Coronal Diagnostic Spectrometer (CDS) on-board SoHO. The observations were obtained in the chromospheric He I, and a series of higher temperature oxygen lines. In this letter we report on the presence of long period oscillations in a polar coronal hole region on the disk. Our observations indicate the presence of compressional waves with periods of 20-30 min or longer.
引用
收藏
页码：L39 / L42
页数：4
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