Kinematic characteristics of the surge on March 19, 1989

Details Kinematic characteristics of the surge on March 19, 1989 Kinematic characteristics of the surge on March 19, 1989

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..240g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 1, p. 240-251

Astronomy and Astrophysics

Astrophysics

18

H Alpha Line, Kinematics, Solar Activity, Solar Flares, Solar Rotation, Spectral Energy Distribution, Stellar Mass Ejection, Stellar Models, Mathematical Models, Solar Corona, Solar Limb, Solar Velocity, Spectroheliographs

Scientific paper

The H-alpha filtergrams, off-band images and H-alpha spectra of a surge and accompanying active objects were obtained at Yunnan Observatory on March 19, 1989. Magnetograms of the corresponding super-active region were also obtained at Huairou-Beijing Observatory. The morphology and evolution of the surge and other active objects are considered based on the H-alpha filtergrams. The analysis of the H-alpha spectral profiles allows us to derive two-dimensional kinematic behaviors and velocity fields of the surge and other active objects. A two-cloud model and Becker's one-cloud model are applied and discussed. The results show that the surge is present not only as an ascending movement with an average velocity V of about 70 km/s, but also a rotational motion with an average angular velocity omega of 1.5 x 10-3 arc/s. Both motions decrease with height above the solar limb. An expansion velocity of 25 km/s is detected. The helical motion in the surge can be explained successfully by the theory of plasma double pole diffusion caused by a sharp density gradient between the surge and the surrounding corona.

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