Observational Research of Plasma Ejection Mechanism in Solar Emerging Flux Region.

在本项目研究期间，我们利用飞驒天文台的无罩太阳望远镜和TRACE卫星同时对太阳爆炸现象（Hα暴流、x射线喷流、EUV喷流和多波长耀斑）进行了多次协调观测。我们得到了以下新的结果，这些结果都有力地支持了太阳等离子体爆炸抛射的磁重联模型。(1)利用日本京都大学飞驒天文台的无丘太阳望远镜对Hα暴流进行了高分辨率观测，发现了Hα暴流区域的两种向下运动特征。一个是沿着同一磁力线向上移动的特征。其他流沿着不同的磁力线，没有发现向上移动的特征。结果表明，这两种沿不同磁力线向下移动的特征可以用新出现的磁环和已存在的日冕磁力线之间的磁场重联来解释。(2)在1999年8月的协调观测中，我们成功地在飞驒天文台和TRACE卫星上同时观测到一个出现在太阳边缘的新通量区。从这些数据的分析中，我们发现171Å中的高温（一百万度）等离子体射流与冷的Hα和Lα浪涌同时喷射。在171Å和Lα图像中也发现了膨胀环和收缩环。这些现象都可以用磁场重联来解释。(3)首次在Hα和1716Å中同时观测到稳定黑子光桥上的等离子体抛射活动。我们发现(a) 171Å喷射的时间和速度与Hα喷射相同，(b)喷射的外观彼此不同；也就是说，Hα喷射具有喷流状，而171Å则具有环状。(4)在Hida、La Palma和TRACE的协同观测中，成功观测到6月6日至7日产生3次x级耀斑的耀斑产生活跃区NOAA 9026。通过对该区域的详细分析，我们发现，当一条强扭曲的新兴磁通量绳从光球滑入日冕时，会产生强烈的耀斑。少

During the period of this research project, we made several coordinated observations of solar explosive phenomena, or Hα surges, X-ray jets, EUV jets and flares in multiple wavelengths by simultaneously using the Domeless Solar Telescope of Hida Observatory and TRACE satellite. We got the following new results which all strongly support the magnetic reconnection model for explosive ejections of solar plasma.(1)From the high resolution observation of Hα surges with the Domeless Solar Telescope at Hida Observatory, Kyoto University, we found two kinds of downward-moving features in the Hα surge regions. One is along the same magnetic field line as that of the upward-moving feature. The other streams are along a different magnetic field line where no upward-moving feature was found. It was shown that these two kinds of downward-moving features along the different magnetic field lines are wellexplained by a magnetic field reconnection between emerging flux loops and pre-existing coronal ma … More gnetic field.(2)At the coodinated observation in August 1999, we succeeded to observe an emerging flux region appearing just on the solar limb simultaneously at Hida observatory and TRACE satellite. From the analyses of these data, we found that high temperature(one-million degrees)plasma jets in 171Å are ejected simultaneously with cool Hα and Lα surges. Expanding loops and shrinking loops are also found both in 171Å and Lα images. These phenomena were all explained by the magnetic field reconection.(3)Conspicuous activities of plasma ejections along a light bridge of a stable sunspot were, for the first time, observed simultaneously in Hα and in 1716Å. We found that(a)the times and velocities of the 171Å ejections are the same as those of Hα ejections and that(b)the appearance of the ejections are different from one another ; i.e., the Hα ejections have a jetlike, while the 171Å are like loops.(4)A flare productive active region NOAA 9026, which produced three X-class flares on 6-7 June, were successufully observed in the coordinated observation among Hida, La Palma, and TRACE.From detailed analyses of the region we found that a strongly-twisted emerging magnetic flux rope produced strong flares when it slipped out from the photosphere into the corona. Less