Other
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pnaoc...1...92z&link_type=abstract
Astronomical Research and Technology. Publications of National Astronomical Observatories of China (ISSN 1672-7673), Vol. 1, No.
Other
Prominence, Velocity Field
Scientific paper
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 V0 towards the observer with an average value of 50 km/s, a rotational angular velocity ω is also detected with an average value being 7×10-4rad·s-1, the height variations of V0 and ω seem opposite with each other.
Liang Hong-Fei
Wang Qiong-Zhen
Zhao Hai-Juan
Zhong Shu-Hua
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