Study of Solar Flares and Development of Magnetic Field

点击翻译按钮获取中文摘要

The Solar-A ('Yohkoh') satellite was launched in August 1991, and has been returning X-ray data of the solar corona and the solar flares. An important knowledge which Yohkoh has brought to us is that a full understanding of the coronal physics inevitably requires supporting ground-based spectroscopic and imaging observations, in particular the observations of the magnetic field on the solar surface.This project aimed 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 China in 1992 September and presented the most recent results from Yohkoh and other instruments. This stimulated the participation of Chinese solar physicists into the analysis of Yohkoh data. In 1993 February, Prof. Ai visited Japan and discussed specific targets of cooperative research. We selected three active regions to study, and scientists in both countries started data analysis. In 1993 July we held a workshop at Sagamihara for summarizing the studies made so far. Nineteen solar physicists from China participated in this meeting, and the proceedings was published. After the meeting the Chinese participants visited several observatories in Japan and investigated the possibility of further cooperative researches. As an outcome of this effort, in 1993 August China participated in an observing campaign in cooperation with Yohkoh for the study of the evolution of emerging flux regions. The initial results will be reported at the meeting of the Astronomical Society of Japan.Another topic of discussion in this project is the space program on solar physics in the future. Both countries have plans to launch an optical telescope to observe the sun in high spatial resolution. Technical issues on the filter instruments to be flown with the satellite were extensively discussed in this program.