arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.05458astro-ph.SR
收藏

太阳活动区NOAA 11158的通量浮现:净电流的演化

Flux Emergence in the Solar Active Region NOAA 11158: The Evolution of Net Current

P. Vemareddy, P. Venkatakrishnan, S. Karthikreddy

摘要:

我们提出了一个详细的调查所观察到的净垂直电流的演变使用的时间序列的矢量磁图的活动区(AR)NOAA 11158日震磁成像仪。我们还讨论了净电流与观测到的喷发事件的关系。AR在6天内从$βγ$演变为$βγδ$构型。AR有两个子区域的活动与相反的手征:一个占主导地位的太阳黑子旋转产生强大的日冕物质抛射,其他显示大的剪切运动产生强烈的耀斑。当黑子分离时,CME产生子区各极的净电流先增大到最大值,然后减小。该子区净电流的时间分布与该子区S极黑子自转速率的时间分布一致。耀斑子区域的净电流在强耀斑发生时突然增加,并保持不变,直到观测结束,而太阳黑子保持紧密接近。观察到的净电流的系统演化被认为是遵循在两个子区域的强剪切极性反转线的总长度的时间演化。所观察到的光球净电流可以解释为一个扭曲的通量绳出现的必然产物,从光球下面的高压限制到光球的低压环境。

英文摘要:

We present a detailed investigation on the evolution of observed net vertical current using a time series of vector magnetograms of the active region (AR) NOAA 11158 obtained from Helioseismic Magnetic Imager. We also discuss the relation of net current to the observed eruptive events. The AR evolved from $βγ$ to $βγδ$ configuration over a period of 6 days. The AR had two sub-regions of activity with opposite chirality: one dominated by sunspot rotation producing a strong CME, the other showing large shear motions producing a strong flare. The net current in each polarity over the CME producing sub-region increased to a maximum and then decreased when the sunspots got separated. The time profile of net current in this sub-region followed the time profile of the rotation rate of the S-polarity sunspot of the same sub-region. The net current in the flaring sub-region showed a sudden increase at the time of the strong flare and remained unchanged till the end of the observation, while the sunspots maintained their close proximity. The systematic evolution of the observed net current is seen to follow the time evolution of total length of strongly sheared polarity inversion lines in both the sub-regions. The observed photospheric net current could be explained as an inevitable product of the emergence of a twisted flux rope, from a higher pressure confinement below the photosphere into the lower pressure environment of the photosphere.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑