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Horizontal flows concurrent with an X2.2 flare in the active region NOAA 11158

机译:在活动区域​​NOAA 11158中同时发生水平流和X2.2耀斑

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Horizontal proper motions were measured with local correlation tracking (LCT) techniques in active region NOAA 11158 on 2011 February 15 at a time when a major (X2.2) solar flare occurred. The measurements are based on continuum images and magnetograms of the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory. The observed shear flows along the polarity inversion line were rather weak (a few 100 m s–1). The counter-streaming region shifted toward the north after the flare. A small circular area with flow speeds of up to 1.2 km s–1 appeared after the flare near a region of rapid penumbral decay. The LCT signal in this region was provided by small-scale photospheric brigthenings, which were associated with fast traveling moving magnetic features. Umbral strengthening and rapid penumbral decay was observed after the flare. Both phenomena were closely tied to kernels of white-light flare emission. The white-light flare only lasted for about 15 min and peaked 4 min earlier than the X-ray flux. In comparison to other major flares, the X2.2 flare in active region NOAA 11158 only produced diminutive photospheric signatures (? 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
机译:在2011年2月15日发生大型(X2.2)太阳耀斑时,使用局部相关跟踪(LCT)技术在活动区域​​NOAA 11158中测量了水平适当运动。这些测量基于太阳动力学天文台上的Heismesismic和Magnetic Imager的连续图像和磁图。沿极性反转线观察到的剪切流相当弱(几百m s –1 )。爆发后,逆流区域向北移动。耀斑在半影快速衰减区域附近出现了一个小圆形区域,流速高达1.2 km s –1 。该区域的LCT信号由小规模的光球Brigthenings提供,它们与快速传播的移动磁特征相关。耀斑后观察到本垒增强和半影快速衰减。两种现象都与白光耀斑发射的内核紧密相关。白光耀斑仅持续约15分钟,并比X射线通量提前4分钟达到峰值。与其他主要耀斑相比,活动区域NOAA 11158中的X2.2耀斑仅产生了较小的光球信号(?2011 WILEY-VCH Verlag GmbH&Co. KGaA,Weinheim)

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