摘要
用"多云模型"光谱方法分析1991年3月5日喷泉状爆发日珥的Hα光谱观测资料,导出了该日珥视向速度的二维分布;通过速度场分析,我们探测到日珥喷射速度和旋转角速度随高度的分布,结果表明该日珥的蓝移速度占绝对优势,速度变化范围为8～110km/s,速度分布不均衡、不对称,日珥中部和底部速度较大、顶部速度较小;日珥南边缘的速度梯度比北边缘的更大;日珥的喷射除表现为上升运动外还显示出向着观测者的、平均速度约为50km/s的视向运动;该日珥的旋转角速度约为7×10-4rad/s,两者随高度的变化显示出相反的特征。
The Hα spectral data observed on March 5,1991 were obtained at Yunnan Observatory for a spray-like eruptive prominence, the 'Multi-Cloud Model' method is applied to derive the 2D velocity field of the prominence. By analyzing the velocity field, an ejection velocity and angular velocity as well as their distributions versus the height are obtained.The results show that the blue-shift velocity of the prominence predominates absolutely, the range of the velocity is from 8 to 110 km/s.The velocity distribution is inhomogeneous and asymmetric: the values of the velocity are bigger in the middle and the base parts than those in the top part of the prominence; velocity gradient near the southern limb is larger than that near the northern one. Ejection movements present not only the ascending movement, but also the line-of-sight velocity V_0 towards the observer with an average value of 50 km/s, a rotational angular velocity ω is also detected with an average value being 7×10^(-4) rad·s^(-1),the height variations of V_0 and ω seem opposite with each other.
出处
《天文研究与技术》
CSCD
北大核心
2004年第2期92-98,共7页
Astronomical Research & Technology
