FORMATION AND DECAY OF RUDIMENTARY PENUMBRA AROUND A PORE
FORMATION AND DECAY OF RUDIMENTARY PENUMBRA AROUND A PORE
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DOI：
10.1088/0004-637x/796/2/77
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
H. Watanabe;R. Kitai;Ken Otsuji
中科院分区：
文献类型：
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作者：
H. Watanabe;R. Kitai;Ken Otsuji
我们使用HINODE卫星在2007年2月3日获得的活性区域NOAA 10940的孔的演变。我们分析了孔的形成，基本的penumbra结构的形成是在5小时后的3.5 mm和3.0 mm grimimate for的3.0 mm中突然消失的。构成Rucklidge等人的预期（1-1.5×1020 mx）我们的观察结果描述了一种罕见的现象，在孔隙和黑子区域之间的阶段不稳定。 hinode fe观察到的通量变化磁化图。在这个衰减阶段开始衰减阶段，在孔的外部发现了多个极性斑块（与penumbra构造位置的不同位置）。由于黑暗的蒙布拉尔区域恢复了约10％，因此半场场似乎变为垂直。
We analyze the evolution of a pore in the active region NOAA 10940 using the data obtained by the Hinode satellite on 2007 February 3. The pore we analyzed showed the formation of a rudimentary penumbra structure, succeeded by an abrupt disappearance after about 5 hr. The pore had an approximate radius of 3.5 Mm and a total magnetic flux of 3.0 × 1019 Mx, which is a little smaller than the necessary magnetic flux for penumbral formation supposed by Rucklidge et al. (1–1.5 × 1020 Mx). Our observation describes a rare phenomenon which was in the unstable phase between a pore and a sunspot. The area of the dark umbra gradually decreased when the rudimentary penumbral filaments formed the penumbral structure, meaning that the penumbra develops at the expense of the umbral magnetic flux. This statement was confirmed by a rough estimation of the magnetic flux variation observed by the Hinode Fe i magnetogram. Five hours after the formation phase, the decay phase began. In this decaying phase, multiple opposite polarity patches are found to appear in the exterior of the pore (a different location from the penumbra formation site). We interpret these opposite polarities as signatures of the horizontal magnetic field, which preferably appears in the course of the unstable reconfiguration of the magnetic field structure. During the course of the disappearance of the penumbra, the horizontal penumbral field seems to become vertical because of the dark umbral area that recovered by about 10%.