Abstract
Multi-Cloud Model(MCM) is an effective method for dealing with asymmetric profiles of spectral line formed by active objects on the sun. A typical example is given for the application of the MCM method in this paper. The Hβ spectral data of a large post-flare loop (PFL) system which occurred on the solar western limb are obtained with MW-SSHG at the Yunnan Observatory and analysed based on the MCM method. The line-of-sight velocity fields observed in different times are derived and discussed.
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