Hi-C OBSERVATIONS OF SUNSPOT PENUMBRAL BRIGHT DOTS
Hi-C OBSERVATIONS OF SUNSPOT PENUMBRAL BRIGHT DOTS
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DOI：
10.3847/0004-637x/822/1/35
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
S. E. Alpert;S. Tiwari;R. Moore;A. Winebarger;S. Savage
中科院分区：
文献类型：
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作者：
S. E. Alpert;S. Tiwari;R. Moore;A. Winebarger;S. Savage
我们报道了利用高分辨率日冕成像仪(Hi-C)观测到的一个太阳黑子半影中的亮点(BDS)，并研究了它们的大小、寿命、速度和强度。BDS的大小约为1“，因此在大气成像组件(AIA)193ä的图像中很难识别，这些图像具有1.2的空间分辨率，但随着Hi-C的空间分辨率提高5倍，BDS的大小很容易被识别出来。我们用友邦保险193ä通频带的数据补充Hi-C数据，以查看在Hi-C三分钟观察期之前和/或持续时间更长的BDS的完整寿命。大多数Hi-C BDS显示出明显的沿半影条纹的横向运动，或者朝向或远离太阳黑子本影。单个BD经常与其他BD相互作用，组合在一起使其褪色或变亮。不与其他BD相互作用的BD往往具有较小的位移。这些BDS的数量大致相同，但平均移动速度慢于田等人最近报道的界面区域成像光谱仪(IRIS)BDS，并且其大小和寿命处于IRIS BDS分布的高端。使用附加的AIA通带，我们比较了BDS的光曲线，以测试Hi-C BDS是否具有像IRIS BDS那样的过渡区(TR)温度。大多数Hi-C BDS的光曲线在不同的AIA通道中出现峰值，表明它们的温度可能在较冷的tR(1−4×105K)范围内。
We report observations of bright dots (BDs) in a sunspot penumbra using High Resolution Coronal Imager (Hi-C) data in 193 Å and examine their sizes, lifetimes, speeds, and intensities. The sizes of the BDs are on the order of 1″ and are therefore hard to identify in the Atmospheric Imaging Assembly (AIA) 193 Å images, which have a 1.″2 spatial resolution, but become readily apparent with Hi-C's spatial resolution, which is five times better. We supplement Hi-C data with data from AIA's 193 Å passband to see the complete lifetime of the BDs that appeared before and/or lasted longer than Hi-C's three-minute observation period. Most Hi-C BDs show clear lateral movement along penumbral striations, either toward or away from the sunspot umbra. Single BDs often interact with other BDs, combining to fade away or brighten. The BDs that do not interact with other BDs tend to have smaller displacements. These BDs are about as numerous but move slower on average than Interface Region Imaging Spectrograph (IRIS) BDs, which was recently reported by Tian et al., and the sizes and lifetimes are on the higher end of the distribution of IRIS BDs. Using additional AIA passbands, we compare the light curves of the BDs to test whether the Hi-C BDs have transition region (TR) temperatures like those of the IRIS BDs. The light curves of most Hi-C BDs peak together in different AIA channels, indicating that their temperatures are likely in the range of the cooler TR (1−4 × 105 K).