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UK-Japan Cooperative Study of Solar Flares with the Yohkoh Mission

英日联合 Yohkoh 任务进行太阳耀斑合作研究

基本信息

批准号：
08044105
负责人：
WATANABE Tetsuya
金额：
$ 1.73万
依托单位：
National Astronomical Observatory
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1996
资助国家：
日本
起止时间：
1996 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044105/
关键词：
Solar flares Solar high energy phenomena Soft X-ray high resolution observation Bragg crystal spectrometer Yohkoh Satellite

项目摘要

Yohkoh has been working very well for more than five years and a half with no serious degradation and its operation entered into a phase in which we can do systematic activity-cycle related analyzes. Collaboration with the SoHO satellite had an important role. SoHO was successfully launched in December, 1995. Database of the half solar cycle and softwares for analysis were completed. Yohkoh Data Analysis Center (YDAC) set up in MSSL has playd a key role in organizing active international collaboration in Europe and became the European center of Yohkoh data flow. Compilation of atmic data helpful for analyzing the Yohkoh and SoHO data also made a good progress by activating discussions among UK and Japanese scientists.The followings are brief summary of the new results : (1)BCS without collimators could diagnose SXV emission lines from single active region on the solar disk that appeared in July, 1996, and collaboration with a rocket experiment, SERTS,made it possible to reveal the temperature structure of an active region in May 1996. (2)SoHO EIT/CDS and Yohkoh SXT simultaneously observed jetlets (tiny jet-like structure) around the polar region, and found that these phenomena were also triggered by magnetic reconnection. (3)Analysis of a large number of impulsive flares seen in HXT suggested a new interpretation for nonthermal particle acceleration, especially for low energy cutoffs.

Yohkoh在五年半多的时间里一直工作得很好，没有严重的退化，它的运行进入了一个我们可以进行与活动周期相关的系统分析的阶段。与SOHO卫星的合作发挥了重要作用。SOHO于1995年12月成功发射。完成了半太阳周期数据库和分析软件的编制。在MSSL设立的Yohkoh数据分析中心(YDAC)在组织欧洲积极的国际合作方面发挥了关键作用，成为Yohkoh数据流的欧洲中心。有助于分析Yohkoh和SOHO数据的大气数据的汇编也取得了良好的进展，在英国和日本科学家之间展开了讨论。以下是新结果的简要总结：(1)1996年7月出现的无准直器的BCS可以诊断太阳盘面上单个活动区的SXV发射线，并与火箭实验SERTS合作，使1996年5月揭示活动区的温度结构成为可能。(2)SOHO EIT/CDS和Yohkoh SXT同时观测到极区附近的急流(微小的急流结构)，发现这些现象也是由磁场重联引起的。(3)对HXT中的大量脉冲耀斑进行了分析，提出了对非热粒子加速的新解释，特别是对低能截止点的解释。