Signatures of very long period waves in the polar coronal holes

被引：42

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.

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页码：L39 / L42

页数：4

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