一个亚耀斑的HeI 10830二维光谱观测

本文介绍了１９９３年１２月２９日一个ＳＦ／Ｃ１．９耀斑过程的ＨｅＩ１０８３０　的二维光谱观测和资料的初步分析，主要结果如下：（１）在直接拼出的ＨｅＩ１０８３０　单色象上未发现有Ｒｕｓｔ提出的强度超过连续谱的耀斑亮点，但在剩余强度图上的确发现有四个小区相对周围变亮。其强度在耀斑爆发过程中有明显变化；（２）所有ＨｅＩ１０８３０　＂亮区＂均落在Ｈ_α耀斑亮区内。反之则不一定有对应；（３）ＨｅＩ１０８３０　＂亮区＂有两个位于黑子半影，一个伸入本影，另一个可能在一个小黑点处；（４）ＨｅＩ１０８３０　在所有亮区均有红移或不对称。表示有≤１６ｋｍ／ｓｅｃ的物质向下运动，速度随耀斑衰减而减小。这个亚耀斑＂亮区＂的特征与我们以前观测到的辐射超过连续谱的发射点极为相似，因而可认为它们具有同一物理起源。其强度小很可能是因为其激发源的Ｘ射线强度弱。

HeI 10830 IMAGE SPECTROSCOPY OBSERVATION OF A SUBFLARE

In this paper introduced are the 2-dimensional spectral observation of a SF/Cl.9 subflare in HeI 10830 on Dec. 29, 1993 and its preliminary data reduction. The main results are as follows: (l) On the monochromatic image of HeI 10830,there is no'bright area',as Rust pointed out, with intesity higher than the continuum,but on the image of residual intensity, there are four areas whose intensities are higher than other points and vary obviously during the flare process,(2)All'bright areas'of HeI 10830 are corresponding to Ha bright areas of the flare, but not vice versa;(3)Two of the'bright areas'are located in the penumbra of sunspot, one extending into the umbra of sunspot and one possibly at a small pore; (4)The profiles of HeI 10830 in all'bright areas' are red-shifted or red asymmetry, indicating that there exists down-ward motion of material with velocity less than 16km/sec. As the flare process goes on, the velocity decreases.The characteristics of this subflare are very similar to those of the points observed before, whose intensities are higher than the continuum. Therefore we think they result from the same physical source, and the low intensities of the 'bright areas' may relate to the X-ray intensity of the exciting sources.