SUMER和TRACE高节奏联合观测中的小尺度流
Small-scale flows in SUMER and TRACE high-cadence co-observations
摘要：
我们报告的物理性质的小规模瞬态流同时观察到高节奏的SUMER光谱仪和TRACE成像仪在一个活跃的区域的谱区。我们的主要目标是提供一个更好地了解太阳大气中的瞬态现象的性质，通过使用高节奏的成像仪和光谱仪在类似的空间和时间分辨率的共同观测。一系列的TRACE Fe IX/X 171 A和高分辨率MDI图像进行了分析，同时获得SUMER观测谱线覆盖的温度范围从10 000 K到1 MK。我们揭示了许多瞬态流的存在下，在小规模的循环（高达30毫米），观察到在一个活跃的区域的plage面积。这些流动的温度从10 000 K（我们观测的低温极限）到250 000 K。由于观测到的日冕线Mg X 624.85 A的混合，这些特征的日冕响应是不确定的。事件的持续时间范围从60秒到19分钟，取决于循环大小。有些气流达到超音速。通常与爆炸事件或双向喷流有关的多普勒频移实际上可以用小尺度环中的流动（其中一些达到超音速）来识别。此外，我们演示了如何的视线效应可以给误导信息的性质所观察到的现象，如果只使用成像仪或光谱仪。
英文摘要：
We report on the physical properties of small-scale transient flows observed simultaneously at high cadence with the SUMER spectrometer and the TRACE imager in the plage area of an active region. Our major objective is to provide a better understanding of the nature of transient phenomena in the solar atmosphere by using high-cadence imager and spectrometer co-observations at similar spatial and temporal resolution. A sequence of TRACE Fe IX/X 171 A and high-resolution MDI images were analysed together with simultaneously obtained SUMER observations in spectral lines covering a temperature range from 10 000 K to 1 MK. We reveal the existence of numerous transient flows in small-scale loops (up to 30 Mm) observed in the plage area of an active region. These flows have temperatures from 10 000 K (the low temperature limit of our observations) to 250 000 K. The coronal response of these features is uncertain due to a blending of the observed coronal line Mg X 624.85 A. The duration of the events ranges from 60 s to 19 min depending on the loop size. Some of the flows reach supersonic velocities. The Doppler shifts often associated with explosive events or bi-directional jets can actually be identified with flows (some of them reaching supersonic velocities) in small-scale loops. Additionally, we demonstrate how a line-of-sight effect can give misleading information on the nature of the observed phenomena if only either an imager or a spectrometer is used.
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