摘要
本文分析了由日冕绿线和红线以及H_α线所得出的环相互作用区的瞬时辐射增强.绿线辐射强度逐渐增至极大,然后衰减,整个寿命约20至30分钟.红线辐射极大比绿线延迟平均8.6分钟,而H_α线极大则比红线延迟平均9.3分钟.用局部磁重联来解释此现象.由辐射致冷时间估计电子密度,并用两种方法估计所释放能量.
In this paper the occasional transient enhancement at the interaction regions of some loops as recorded in coronal images of FeXIV(5303A) and FeX (6374A), and the associated images in H_α have been analyzed. The brightness of a green line enhancement gradually inreases to a maximum and then fades with a typical lifetime of about 20—30 minutes. The maximum of the red line enhancement at the same location follows that of the green line on average by 8.6 minutes, and H,, then reaches a maximum in extent on average 9.3 minutes after the red line maximum. This phenomenon is interpreted as a process of localized magnetic reconnection. Estimates of the electron density are derived from the cooling time, and the values of dissipated energy are obtained by two separate methods.
出处
《天文学报》
CSCD
北大核心
1991年第3期233-238,T002,共7页
Acta Astronomica Sinica
基金
国家自然科学基金
关键词
冕环
相互作用
电子密度
能量
Coronal loops—Interaction—Electron density and energy
