Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp51c..06x&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP51C-06
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7519 Flares, 7524 Magnetic Fields, 7529 Photosphere, 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
Three X-class white-light flares were captured by BBSO observing team at NSO in 2003 and the Solar Optical Telescope (SOT) on board HINODE in 2006. They were all typical two-ribbon flares and the flare ribbons were resolved to the diffraction limit in G-band observations. We measure the velocities of ribbon-motion Vn for different flaring kernels and the corresponding magnetic flux density Bn. We compare the correlation between Vn and Bn with previous obtained empirical relationship. In addition, we investigate the temporal evolution of shear-angle between conjugate foot-points and magnetic neutral line using both Hard X-ray (HXR) observation obtained by Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and G-band data. The results show clear decrease of shear-angles, indicating motion of flare kernels along the flare ribbons in early stage of flares. The optical observations including G-band show that some isolated HXR flare kernels are actually connected by the optical flare ribbons. Using the high resolution cleaned HXR images, we also present the spectral information obtained for all the HXR kernels and discuss the difference of spectral index in the different magnetic field environment.
Cao Weiqun
Jing Ji-liang
Wang Hai-Hong
Xu Yadong
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