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arXiv 0905.1553astro-ph.SR
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Hinode观测的颗粒化与小尺度磁通量的相互作用

Interaction between Granulation and Small-Scale Magnetic Flux Observed by Hinode

Jun Zhang, Shuhong Yang, Chunlan Jin

摘要:

我们研究了宁静太阳中颗粒发育与磁场演化之间的关系。给出了6个典型的颗粒与磁性元素相互作用的例子,得到了以下结果。(1)当颗粒细胞内没有磁通量出现时,颗粒中心对称地发育。(2)一个颗粒的发展和分裂非中心对称,而通量出现在外部的颗粒细胞。(3)一旦颗粒破碎,就在颗粒的位置处检测到作为混合极性的群集出现的磁通量。(4)偶极伴随着颗粒的发育而出现,偶极的两个元素扎根于相邻的颗粒间通道中,并隔着颗粒相向。在水平颗粒运动的平流作用下,偶极子的正分量与先前存在的负通量相抵消。(5)通量抵消也发生在由颗粒流平流输送的正元件与其周围的负通量之间。(6)当颗粒细胞发生磁通量抵消时,颗粒收缩然后消失。(7)水平磁场在偶极出现和相反极性相互抵消的地方增强,但只有偶极元件之间的水平场从正元件到负元件有序地指向。我们的研究结果表明,颗粒和小尺度磁通量相互影响。颗粒流平流磁通量,和磁通量演变抑制颗粒的发展。在一个相消磁元处存在极大的多普勒蓝移。这一现象可能是光球层下方磁重联产生的向上流动所造成的。

英文摘要:

We study the relationship between granular development and magnetic field evolution in the quiet Sun. 6 typical cases are displayed to exhibit interaction between granules and magnetic elements, and we have obtained the following results. (1) A granule develops centrosymmetrically when no magnetic flux emerges within the granular cell. (2) A granule develops and splits noncentrosymmetrically while flux emerges at an outer part of the granular cell. (3) Magnetic flux emergence as a cluster of mixed polarities is detected at the position of a granule as soon as the granule breaks up. (4) A dipole emerges accompanying with the development of a granule, and the two elements of the dipole root in the adjacent intergranular lanes and face each other across the granule. Advected by the horizontal granular motion, the positive element of the dipole then cancels with pre-existing negative flux. (5) Flux cancellation also takes place between a positive element, which is advected by granular flow, and its surrounding negative flux. (6) While magnetic flux cancellation takes place at a granular cell, the granule shrinks and then disappears. (7) Horizontal magnetic fields enhance at the places where dipoles emerge and where opposite polarities cancel with each other, but only the horizontal fields between the dipolar elements point orderly from the positive element to the negative one. Our results reveal that granules and small-scale magnetic flux influence each other. Granular flow advects magnetic flux, and magnetic flux evolution suppresses granular development. There exist extremely large Doppler blue-shifts at the site of one cancelling magnetic element. This phenomenon may be caused by the upward flow produced by magnetic reconnection below the photosphere.

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