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arXiv 1209.0867astro-ph.SR
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AR 10960中EUV喷流的多波长光谱观测

Multi-wavelength spectroscopic observation of EUV jet in AR 10960

Y. Matsui, T. Yokoyama, N. Kitagawa, S. Imada

摘要:

我们研究了太阳极紫外射流的速度与温度之间的关系。2007年6月5日,高度加速的喷流出现在活动区NOAA 10960。EIS/Hinode的多波长光谱观测使我们能够在很宽的温度范围内研究多普勒速度。利用STEREO软件对射流进行了立体分析,得到了射流的三维角度。利用这个角度和多普勒速度,我们导出了射流的真实速度。结果发现,用\ion{He}{2} 256型$\log_{10}T_e[\rm{K}] = 4.9$观测到的冷喷流被加速到$220 \rm{km/s}$附近,这超过了色球蒸发的上限。其他谱线观测到的速度都低于色球蒸发的上限,而大多数热谱线的速度都高于冷谱线。我们认为色球蒸发和磁场加速是同时发生的。利用多仪器观测资料,给出了基于重联模型的形态学解释。

英文摘要:

We have studied the relationship between the velocity and temperature of a solar EUV jet. The highly accelerated jet occurred in the active region NOAA 10960 on 2007 June 5. Multi-wavelength spectral observations with EIS/Hinode allow us to investigate Doppler velocities at the wide temperature range. We analyzed the three-dimensional angle of the jet from the stereoscopic analysis with STEREO. Using this angle and Doppler velocity, we derived the true velocity of the jet. As a result, we found that the cool jet observed with \ion{He}{2} 256 Å$\log_{10}T_e[\rm{K}] = 4.9$ is accelerated to around $220 \rm{km/s}$ which is over the upper limit of the chromospheric evaporation. The velocities observed with the other lines are under the upper limit of the chromospheric evaporation while most of the velocities of hot lines are higher than that of cool lines. We interpret that the chromospheric evaporation and magnetic acceleration occur simultaneously. A morphological interpretation of this event based on the reconnection model is given by utilizing the multi-instrumental observations.

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