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arXiv 0806.2700astro-ph
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在太阳黑子本影-半影边界附近看到的增强的p模吸收

Enhanced p-Mode Absorption seen near the Sunspot Umbral-Penumbral Boundary

Shibu K. Mathew

摘要:

我们使用SOHO/MDI高分辨率多普勒图像研究了太阳黑子的p模吸收。本文用一个三个半小时的数据集计算出的多普勒功率来研究太阳黑子的吸收。结果表明,在太阳黑子的本影-半影边界附近,吸收增强。我们试图将观测到的吸收与太阳黑子的磁场结构联系起来。利用观测到的SOHO/MDI视线磁图计算了位场的横向分量。功率图和计算的势场的比较表明,在计算的横向场强度较高的阴影-半影边界附近的吸收增强。

英文摘要:

We investigate p-mode absorption in a sunspot using SOHO/MDI high-resolution Doppler images. The Doppler power computed from a three and a half hour data set is used for studying the absorption in a sunspot. The result shows an enhancement in absorption near the umbral-penumbral boundary of the sunspot. We attempt to relate the observed absorption with the magnetic field structure of the sunspot. The transverse component of the potential field is computed using the observed SOHO/MDI line-of-sight magnetograms. A comparison of the power map and the computed potential field shows enhanced absorption near the umbral-penumbral boundary where the computed transverse field strength is higher.

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