Flows in sunspot plumes detected with the Solar and Heliospheric Observatory

被引：20

作者：

Brynildsen, N ^{[1
]}

Maltby, P ^{[1
]}

Brekke, P ^{[1
]}

Fredvik, T ^{[1
]}

Haugan, SVH ^{[1
]}

Kjeldseth-Moe, O ^{[1
]}

Wikstol, O ^{[1
]}

机构：

[1] Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway

来源：

ASTROPHYSICAL JOURNAL | 1998年 / 502卷 / 01期

关键词：

Sun : corona; Sun : transition region; Sun : UV radiation; sunspots;

D O I：

10.1086/311482

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Bright extreme-UV sunspot plumes have been observed in eight out of 11 different sunspot regions with the Coronal Diagnostic Spectrometer on Solar and Heliospheric Observatory. From wavelength shifts, we derive the line-of-sight velocity relative to the average velocity in the rastered area, 120 " x 120 ". In sunspot plumes, we find that the motion is directed away from the observer and increases with increasing line formation temperature, reaches a maximum between 15 and 41 km s(-1) close to log log T approximate to 5.5, then decreases abruptly. The flow field in the corona is not well correlated with the flow in the transition region, and we discuss briefly the implication of this finding.

引用

页码：L85 / L90

页数：6

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