Ultraviolet observations of periodic annular intensity fluctuations propagating around sunspots

被引：11

作者：

Georgakilas, AA ^{[1
]}

Muglach, K

Christopoulou, EB

机构：

[1] CALTECH, Pasadena, CA 91125 USA

[2] Astrophys Inst Potsdam, D-14473 Potsdam, Germany

[3] Univ Patras, Elect Lab, GR-26110 Patras, Greece

来源：

ASTROPHYSICAL JOURNAL | 2002年 / 576卷 / 01期

关键词：

Sun : oscillations; sunspots;

D O I：

10.1086/341533

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analyze UV observations of an isolated sunspot taken with the Transition Region and Coronal Explorer. We produced "space/time slice images," which reveal periodic, inward-propagating, intensity fluctuations in the inner photospheric penumbra and periodic, outward-propagating, annular intensity fluctuations in the outer penumbra and the area around the sunspot. The average propagation velocity of the inward- and outward-propagating intensity flows is about 0.5 and 1 km s(-1), respectively, and the distance between subsequent crests is about 2500 km. Using observations obtained with the Michelson Doppler Imager, we found propagating magnetic field enhancements that present a spatial and temporal coherence with the UV intensity fluctuations. We have not observed any waves similar or related to the chromospheric 5 minute waves.

引用

页码：561 / 566

页数：6

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