The triggering and subsequent development of a solar flare.
The triggering and subsequent development of a solar flare.
复制标题
太阳耀斑的触发和随后的发展。
DOI：
--
复制
发表时间：
1976
期刊：
影响因子：
--
通讯作者：
J. Vorpahl
中科院分区：
文献类型：
--
作者：
J. Vorpahl
1973年9月5日1827 UT的耀斑的高时间和空间分辨率的太阳X射线照片是用阿波罗望远镜架上的S-056航空航天公司/马歇尔太空飞行中心望远镜拍摄的。每隔9秒拍摄的照片可以获得有关能量释放地点以及耀斑本身演变的详细信息。观测结果表明，耀斑发生在一个完整的弧线，而不是在任何一个单一的环。不同X射线特征的连续增亮表明，某些激发以180- 280 km s/sup-1/的速度垂直于拱廊的磁场移动。最强烈的X射线特征位于组成拱形结构的磁场具有小曲率半径的地方，水平场梯度高于周围区域，并且拱形结构的轴改变了方向。有人认为，拱廊几何形状强烈影响的触发扰动的传播，以及随后的能量沉积的存储和网站。磁声波的传播机制触发不稳定性，可能已经存在于耀斑前的结构。这一事件表明，在耀斑期间发射的所有能量不需要立即释放，也不需要在同一位置释放，从而消除了许多耀斑理论中遇到的一些问题。讨论了能量释放的条件。(AIP)«少
High temporal and spatial resolution solar X-ray pictures of a flare at 1827 UT on 1973 September 5 were taken with the S-056 Aerospace Corporation/Marshall Space Flight Center telescope on the Apollo Telescope Mount. Photographs taken at 9 s intervals allow detailed information to be obtained about the site of the energy release, as well as about the evolution of the flare itself. Observations suggest that the flare occurred in an entire arcade of loops rather than in any single loop. Sequential brightening of different X-ray features indicates that some excitation moved perpendicular to the magnetic field of the arcade at velocities of 180--280 km s/sup -1/. The most intense X-ray features were located in places where the magnetic field composing the arcade had a small radius of curvature with horizontal field gradients higher than the surrounding region and where the axis of the arcade changed direction. It is felt that the arcade geometry strongly influenced the propagation of the triggering disturbance, as well as the storage and site of the subsequent deposition of energy. A magnetosonic wave is suggested as the propagating mechanism triggering instabilities that may have existed in the preflare structure. This event demonstrates that all energymore » emitted during a flare need not be released immediately nor in the same location, thereby eliminating some problems encountered in many flare theories. Conditions for energy release are discussed. (AIP)« less