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THE OBSERVATION OF SUNSPOT LIGHT-BRIDGE STRUCTURE AND DYNAMICS

机译:太阳黑子光桥结构和动力学的观测

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We present very high resolution multiwavelength images of a sunspot light bridge in NOAA Active Region 10132 taken at the Swedish 1 m Solar Telescope on La Palma on 2002 September 25. The adaptive optics-corrected images resolve 100 km scale bright grains on either side of an approximately 380 km dark lane in the center of the bridge. Movies of the data show the grains in a steady unidirectional flow with an average speed of 900 m s~(-1) along the entire length of the bridge. Overturning motions are seen in the larger grains, suggesting a convective origin for these structures. Simultaneous 160 nm ultraviolet images from the Transition Region and Coronal Explorer (TRACE) satellite show a constant brightness enhancement over the light bridge, implying a steady chromospheric heat source. TRACE 160 nm movies do not resolve the unidirectional flow; instead, they suggest that a horizontal oscillatory motion exists in the chromosphere of the light bridge. A C2.0 flare at 16:00 UT, one ribbon of which occurs directly along the light bridge, indicates a high level of magnetic stress and impulsive dissipation associated with the observed light-bridge dynamics.
机译:我们提供了2002年9月25日在拉帕尔玛岛的瑞典1 m太阳望远镜上拍摄的NOAA活动区10132中的太阳黑子光桥的高分辨率多波长图像。自适应光学校正后的图像可分辨100 km尺度的明亮颗粒。桥中心约380公里的黑暗车道。数据的电影显示,在整个桥梁的整个过程中,晶粒呈稳定的单向流动,平均速度为900 m s〜(-1)。在较大的谷物中可以看到倾覆运动,表明这些结构的对流起源。来自过渡区和日冕总管(TRACE)卫星的160 nm紫外图像同时显示了整个光桥的恒定亮度增强,这意味着存在稳定的色球热源。 TRACE 160 nm电影无法解决单向流动;相反,他们建议在光桥的色球中存在水平振荡运动。 UT 16:00发生C2.0耀斑,其中一条带直接沿光桥出现,表明与观察到的光桥动力学相关的高水平的磁应力和脉冲耗散。

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