权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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：
06044229
负责人：
WATANABE Tetsuya
金额：
$ 4.86万
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：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06044229/
关键词：
Solar Flares Solar High Energy Phenomena Soft X-ry High Resolution Observation Bragg Spectrometer 科学衛星「ようこう」

项目摘要

The sun observing satellite YOHKOH has been successfully operated for five years from the previous activity maximum and throughout the declining phase.All the scientific instruments onboard has been in good condition and the soft X-ray instruments can observe the quiet sun even at its minimum.Investigating the whole set of data, the keyword of "magnetic reconnection" has been emerged as a fundamental process for producing high temperature plasmas in the corona.Loop-top hard X-ray sources newly found by Yohkoh show consistency with the "magnetic reconnection scenario." Characteristic of nonthermal line broadenings seen in helium-like sulphur lines were systematically investigated.The locations of hot plasmas at the time of the line broadening maximum were either footpoints or loop top of flaring loops.Statistical studies of X-ray jets were also completed and they were mostly found in active regions with mixed magnetic polarity and strongly associated with emerging-flux regions.The interaction of emerged magnetic fields with pre-existing coronal field causes X-ray jets.Correspondence with micro-flares also suggests that the both phenomena come from the same mechanism.On the other hand, some evidence also appeared for the mechanism of basic coronal heating was something other than "magnetic reconnection."The Yohkoh dataset was compiled for nearly half of the solar cycle, with which studies of solar cycle and solar dynamo mechanisms will be done in future.The SoHO satellite launched in December 1995 will now station at the Lagrangean point and start its observations.Joint observations and collaborative studies with SoHO will be highly encouraged for the first space observations in the rising phase of the solar activity.

太阳观测卫星YOHKOH从之前的活动极大期到整个衰退阶段，已经成功运行了5年，机上的所有科学仪器一直处于良好状态，软X射线仪器即使在最小值时也能观测到安静的太阳，通过对整套数据的调查“磁重联”这一关键词已经成为在日冕中产生高温等离子体的一个基本过程。Yohkoh新发现的射线源与“磁重联”情景一致。“我们系统地研究了类氦硫谱线中非热谱线展宽的特征。谱线展宽最大值出现时热等离子体的位置要么是耀斑环的足点，要么是环顶。我们还完成了X射线喷流的统计研究，它们大多出现在具有混合磁极性的活动区，并与新出现的X射线喷流密切相关。磁通区。新出现的磁场与预先存在的日冕场相互作用产生X射线喷流。与微耀斑的对应也表明这两种现象来自同一机制。另一方面，一些证据也表明，基本日冕加热的机制并非是“磁重联”。“Yohkoh数据集是为近一半的太阳活动周期编制的，未来将利用该数据集进行太阳活动周期和太阳发电机机制的研究。1995年12月发射的SoHO卫星现已进驻拉格朗日点并开始观测，我们非常鼓励与SoHO联合观测和合作研究，以便在太阳活动上升阶段进行首次空间观测。