arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.1238astro-ph.SR
收藏

宁静太阳中通量出现、分裂、合并和抵消的探测

Detection of flux emergence, splitting, merging, and cancellation in quiet Sun

Y. Iida, H. Hagenaar, T. Yokoyama

摘要:

我们通过自动检测来调查磁活动的频率,即通量出现、分裂、合并和消除,以了解Parnell等人(2009)报告的磁通量幂律分布的产生。本文利用Hinode/ SOT在Na I线上观测到的太阳静磁图。研究的补丁范围从10^{17}Mx到10^{19}Mx。出现和取消比合并和分裂少得多。分裂的时间尺度被发现是~33分钟,是独立的通量中包含的分裂补丁。此外,磁补丁分裂成任何磁通量的内容具有相同的概率。结果表明,这样的碎裂过程导致一个分布的幂律指数-2。合并对通量含量的依赖性很弱,只有-0.33的幂律指数。这些结果表明:(1)磁斑通过分裂、合并和微小抵消而破碎;(2)在这些破碎之后,通量通过微小抵消从光球中移除。

英文摘要:

We investigate the frequency of magnetic activities, namely flux emergence, splitting, merging, and cancellation, through an automatic detection in order to understand the generation of the power-law distribution of magnetic flux reported by Parnell et al. (2009). The quiet Sun magnetograms observed in the Na I line by Hinode/ SOT is used in this study. Investigated patches range from 10^{17}Mx to 10^{19}Mx. Emergence and cancellation are much less frequent than merging and splitting. The time scale for splitting is found to be ~33 minutes and is independent of the flux contained in the splitting patch. Moreover magnetic patches split into any flux contents with an equal probability. It is shown that such a fragmentation process leads to a distribution with a power-law index -2. Merging has a very weak dependence on flux content only with a power-law index -0.33. These results suggest that 1) magnetic patches are fragmented by splitting, merging, and tiny cancellation; 2) flux is removed from the photosphere through tiny cancellations after these fragmentations.

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。

↑