Structure and evolution of the April 27, 1981 post-flare loop

Details Structure and evolution of the April 27, 1981 post-flare loop Structure and evolution of the April 27, 1981 post-flare loop

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004newa...10..121l&link_type=abstract

New Astronomy, Volume 10, Issue 2, p. 121-132.

Astronomy and Astrophysics

Astronomy

1

Sun: Flares, Post-Flare Loop, Separate Loop Method, Multi-Cloud Model

Scientific paper

A time series of Hα filtergrams and two-dimensional Hα spectral data of the well-known post-flare loop system of April 27, 1981 are obtained at the Yunnan Observatory. The two-dimensional spectral data are analyzed quantitatively by means of the `multi-cloud model' method. The line-of-sight velocity fields of the post-flare loop system are derived for three different times. The post-flare loop system is composed of a loop and an ejection. The loop almost faces the observer and the ejection is along the line-of-sight. A `double-loop' model is proposed in order to explain the structure and evolution of the post-flare loop system. The distributions of the line-of-sight velocity and the evolution time of the post-flare loop system derived from a free-fall model are similar to those obtained from the observations.

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