Enhanced Joule Heating in Umbral Dots

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• 作者：Chandan Joshi ; Lokesh Bharti and S. N. A. Jaaffrey
• 关键词：Sun ; Sunspot ; Magnetic field ; Umbral dots
• 刊名：Solar Physics
• 出版年：2007
• 出版时间：October, 2007
• 年：2007
• 卷：245
• 期：2
• 页码：239-245
• 全文大小：232.2 KB

文摘

We present a study of magnetic fields in umbral dots (UDs) and its consequences on the Joule heating of the UDs. Hamedivafa (Astron. Astrophys. 407, 761, 2003) studied the Joule heating using the vertical component of the magnetic field. In this paper the magnetic field profile in the UDs is investigated by including a new azimuthal component of the magnetic field that might explain a relatively large enhancement of Joule heating causing higher brightness near the circumference of the UDs.