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A statistical study of shear motion of EUV footpoints in two-ribbon flares

Published online by Cambridge University Press:  01 November 2006

Y. N. Su ,
L. Golub ,
A. A. Van Ballegooijen  and
G. L. Huang
Y. N. Su
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA email: ynsu@head.cfa.harvard.edu Purple Mountain Observatory, Nanjing, 210008, China Graduate University of Chinese Academy of Sciences, China
L. Golub
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA email: ynsu@head.cfa.harvard.edu
A. A. Van Ballegooijen
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA email: ynsu@head.cfa.harvard.edu
G. L. Huang
Affiliation:
Purple Mountain Observatory, Nanjing, 210008, China
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Abstract

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We present a statistical investigation of shear motion of the EUV footpoints in two-ribbon solar flares, using the high spatial resolution data obtained in 1998–2005 by the Transition Region and Coronal Explorer (TRACE). In this study we have selected 50 well-observed X- and M- class two-ribbon flares. Our preliminary results are: a) 86% (43 out of 50) of these flares show shear change of footpoints and ribbon separation; b) there is no obvious ribbon separation in those 7 flares which have no shear change of the conjugate footpoints; c) in most events, the cessation of shear change is 0–2 minutes earlier than the end of the impulsive phase.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S233: Solar Activity and its Magnetic Origin , March 2006 , pp. 409 - 410
Copyright
© 2006 International Astronomical Union