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arXiv 1002.4274astro-ph.SR
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磁抵消场周围的磁场和速度结构

Magnetic Fields and Velocity Structures around a Cancellation Site

Y. Iida, T. Yokoyama, K. Ichimoto

摘要:

抵消被认为是光球磁场的一个基本过程,在磁通量收支和太阳的各种活动中起着重要的作用。这种现象有两种主要的理论假设,即“U形圈浮现”和Omega圈淹没模型。为了估计太阳磁通量通过地表的输运,弄清在抵消过程中哪一个是主导过程是很重要的。利用日之出卫星上的太阳光学望远镜,研究了宁静太阳相消前后的矢量磁场和速度结构。发现了连接抵消磁特征的横向磁场和强的长时多普勒红移信号,在抵消发生后的第一次偏振光谱观测中观测到横向磁场,而红移明显滞后于抵消发生20分钟。这些结果表明,所观察到的抵消是一个欧米茄环淹没。

英文摘要:

A cancellation is thought to be a basic process of the photospheric magnetic field and plays an important role in magnetic flux budget and in various solar activities. There are two major theoretical scenarios for this phenomena, i.e. the "U-loop emergence" and the Omega-loop submergence models. It is important to clarify which is the dominant process during the cancellation for the estimation of the solar magnetic flux transport through the surface. We study the vector magnetic field and velocity structures around a quiet Sun cancellation by using the Solar Optical Telescope on board Hinode satellite. Transverse magnetic field connecting the canceling magnetic features and strong long-lasting Doppler red-shift signal are found. The transverse field is observed in the first spectropolarimetric observation after the occurrence of the cancellation while the red-shift clearly delayed to the cancellation by 20 minutes. These results indicate that the observed cancellation is an Omega-loop submergence.

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。

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