arXiv 1105.07582011-05-04astro-ph.SR

扭曲磁通量管出现的特征

On Signatures of Twisted Magnetic Flux Tube Emergence

Santiago Vargas Dominguez, David MacTaggart, Lucie Green, Lidia van Driel-Gesztelyi, Alan Hood

备注：: 14 pages, 8 figures, accepted for publication in Solar Physics
DOI：: 10.1007/s11207-011-9789-3

摘要：

Okamoto {\it et al.}（{\it Astrophys. J. Lett.} {\bf 673}，215，2008;{\it Astrophys. J.} {\bf 697}，913，2009）已经将极性的变化宽度和水平磁场分量的反转的光球观测解释为活动区域内和沿着其内部极性反转线（PIL）的扭曲通量管的出现的特征。沿着PIL观察到一个灯丝，并假设活动区具有拱形结构。为了研究这种情况，MacTaggart和Hood（{\it Astrophys. J. Lett.} {\bf 716}，219，2010）构建了出现在上覆拱廊中的扭曲圆柱体的动态通量出现模型。Okamoto {\it et al.} (2008，2009年）存在于模型中，尽管它们的基本物理机制不同。该模型还产生了两个额外的签名，可以通过观察来验证。第一个是在PIL两侧光球层中无符号磁通量的增加。第二个是与扭曲通量管出现相关的特征光球流剖面的行为。我们在AR 10953中寻找这两个签名，并发现沿着PIL出现扭曲通量管的负面结果。相反，我们解释的光球行为沿PIL指示光球磁抵消驱动的流量从占主导地位的太阳黑子。虽然我们反对通量出现在这个特定的区域内，工作表明理论和观测之间的重要关系，成功地发现和解释的签名通量出现。

英文摘要：

Recent studies of NOAA active region 10953, by Okamoto {\it et al.} ({\it Astrophys. J. Lett.} {\bf 673}, 215, 2008; {\it Astrophys. J.} {\bf 697}, 913, 2009), have interpreted photospheric observations of changing widths of the polarities and reversal of the horizontal magnetic field component as signatures of the emergence of a twisted flux tube within the active region and along its internal polarity inversion line (PIL). A filament is observed along the PIL and the active region is assumed to have an arcade structure. To investigate this scenario, MacTaggart and Hood ({\it Astrophys. J. Lett.} {\bf 716}, 219, 2010) constructed a dynamic flux emergence model of a twisted cylinder emerging into an overlying arcade. The photospheric signatures observed by Okamoto {\it et al.} (2008, 2009) are present in the model although their underlying physical mechanisms differ. The model also produces two additional signatures that can be verified by the observations. The first is an increase in the unsigned magnetic flux in the photosphere at either side of the PIL. The second is the behaviour of characteristic photospheric flow profiles associated with twisted flux tube emergence. We look for these two signatures in AR 10953 and find negative results for the emergence of a twisted flux tube along the PIL. Instead, we interpret the photospheric behaviour along the PIL to be indicative of photospheric magnetic cancellation driven by flows from the dominant sunspot. Although we argue against flux emergence within this particular region, the work demonstrates the important relationship between theory and observations for the successful discovery and interpretation of signatures of flux emergence.

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