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Evolving Features of Hβ Doppler Velocity Fields at Sites of Flares

Published online by Cambridge University Press:  12 April 2016

Wei Li ,
Guoxiang Ai  and
Hongqi Zhang
Wei Li
Affiliation:
Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing, 100080, China
Guoxiang Ai
Affiliation:
Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing, 100080, China
Hongqi Zhang
Affiliation:
Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing, 100080, China

Abstract

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We analyzed eight active regions with more than 600 flare kernels and ribbons, and relevant time sequence Hβ chromospheric Dopplergrams. These data showed that during several hours prior to the flares, the velocity field evolves so that the sites of the flare kernels and ribbons become close to the inversion line of the velocity field. This result holds regardless of whether or not the flare sites are wholly located in blue-shifted areas, or are far from the the inversion line of the line-of-sight velocity field, or are partly within red-shifted areas.

Type
Session 5. Fields in the Chromosphere and Corona
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 267 - 270
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Ai, G. 1987, Publ. Beijing Astron. Obs., 9, 27 Google Scholar
Ai, G., Zhang, H., Li, W., Li, J., & Chen, J. 1989, Solar-Terrestrial Predictions: Proceedings of a Workshop at Leura, Australia October 16-20, 1989, 1, 264 Google Scholar