Solar Physics in High Spatial Resolution

1991年8月发射了Solar-A（“Yohkoh”）卫星。这颗卫星旨在用X射线研究太阳。到目前为止，该卫星的性能相当令人满意，传回了日冕和太阳耀斑的光谱和成像数据。Yohkoh给我们带来的一个重要知识是，日冕的动态和磁结构比我们预期的更强，要充分了解日冕物理学，就必须以最佳分辨率观测色球层和光球层。我们提出的项目旨在将两国观测设施获得的高质量光学数据与Yohkoh的X射线数据结合起来。为此目的，日本与会者访问了基彭霍伊尔研究所，并讨论了在这一合作方案下将开展的科学方案。作为这一合作的结果，在1993年8月3日至13日期间进行了第一次协调观察。世界各地的天文台，包括日本和加那利群岛（西班牙）的天文台参加了这一活动。在1994年2月举行的一次讲习班上确定并分析了几个有趣的研究课题。这一活动的初步成果将提交日本天文学会春季会议。

The Solar-A ('Yohkoh') satellite was launched in August 1991. This satellite aims at studying the sun in X-ray. So far the satellite performs quite satisfactorily, returning spectroscopic and imaging data of the solar corona and the solar flares. An important knowledge which Yohkoh has brought to us is that the solar corona is more dynamic and magnetically structured than we anticipated, and full understanding of the coronal physics inevitably requires the observations of the chromosphere and the photosphere with the best available resolution.The project we proposed aims at combining high quality optical data obtained at the observing facilities in both countries together with X-ray data from Yohkoh. For this purpose the Japanese participants visited Kiepenheuer Institute and discussed scientific programs to be pursued under this cooperative program. As an outcome of this cooperation, the first coordinated observation was carried out in the period of 3-13 August, 1993. Observatories around the world including those in Japan and in the Canary islands (Spain) participated in this campaign. Several interesting research topics were identified and analyzed in a workshop held in 1994 February. Initial results of this campaign will be presented at the spring meeting of the Astronomical Society of Japan.