Small-scale H a jets in the solar chromosphere
Small-scale H a jets in the solar chromosphere
复制标题
太阳色球层中的小规模 H a 喷流
DOI：
10.1051/0004-6361/201117427
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发表时间：
2011
影响因子：
6.5
通讯作者：
Kuridze D
中科院分区：
文献类型：
--
作者：
Kuridze D
目的利用邓恩太阳望远镜上太阳大气快速振荡(ROSA)多波长成像仪的高时间和空间分辨率观测数据，研究一个新出现的太阳活动区小尺度H-α喷流的速度。方法该数据集包括H-α核、CaII-K和G波段的同时成像和光球层视线磁图。结果H-α图像具有很强的动态特性，估计喷流速度高达45公里S-1。这些急流是单向的，它们的起源似乎与潜在的Ca II K亮化和G带磁亮点有关。结论冷冕环的虹吸流模型适合解释我们的观测结果。这些喷流与小规模的爆炸事件有关，并可能提供从光球层到日冕的大量外流。
AimsHigh temporal and spatial resolution observations from the Rapid Oscillations in the Solar Atmosphere (ROSA) multiwavelength imager on the Dunn Solar Telescope are used to study the velocities of small-scale Hαjets in an emerging solar active region.MethodsThe dataset comprises simultaneous imaging in the Hαcore, Ca ii K, and G band, together with photospheric line-of-sight magnetograms. Time-distance techniques are employed to determine projected plane-of-sky velocities.ResultsThe Hαimages are highly dynamic in nature, with estimated jet velocities as high as 45 km s-1. These jets are one-directional, with their origin seemingly linked to underlying Ca ii K brightenings and G-band magnetic bright points.ConclusionsIt is suggested that the siphon flow model of cool coronal loops is suitable for interpreting our observations. The jets are associated with small-scale explosive events, and may provide a mass outflow from the photosphere to the corona.