摘要
为了得到太阳速度场的三维图像,除由观测直接取得二维的速度场图外,还须测定视向速度的深度梯度。长期以来不少天文工作者钻研这一课题,建立了一些用谱线轮廓推求速度梯度的方法。本文先阐述解决这一问题的理论前提,然后依次就日面上的吸收谱线和日珥、边缘耀斑等的发射谱线,论述利用谱线的不对称性等特征,推求速度场梯度的各种方法。最后对今后的工作提出一些概括性的意见。
In order to get the three-dimensional configuration of velocity fields on the Sun, we have to obtain not only the two-dimensional velocity field maps given by direct observations but also the depth gradients of line-of-sight velocities. For a long time many astronomers have been engaged in this work and established some methods of deriving velocity gradients by means of the theoretical analyses of spectral line profiles. Besides the theoretical basis of the solution of this problem this paper describes at first three methods of determination of the gradients of velocity fields on the solar disc with the profiles of absorption lines and secondly the methods of derivation of velocity gradients of prominences and limb flares by use of the asymmetry and other characteristics of emission lines. Finally, we make some comments about the further development of work in this field.
出处
《天文学进展》
CSCD
北大核心
1989年第2期98-106,共9页
Progress In Astronomy
基金
国家自然科学基金
