Detection of Explosive Chromospheric Evaporation During a Two-Ribbon Flare

Details Detection of Explosive Chromospheric Evaporation During a Two-Ribbon Flare Detection of Explosive Chromospheric Evaporation During a Two-Ribbon Flare

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e..15l&link_type=abstract

Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R

Physics

Scientific paper

We present two-dimensional spectral observations of an X1.2 two-ribbon flare in which blue asymmetry of Hα profiles are found at one kernel for more than 1 min. It is interesting that this kernel seems to move along a flare loop seen on the Transition Region and Coronal Explorer (TRACE) images since its appearance. While on the loop footpoints, the Hα profiles are found to be red shifted. The statistical distribution and the spatial distribution of the blue asymmetry at the kernel are also studied. There seems to be a counterpart of the kernel on TRACE 1600 Å images. We calculate the moving speed of the kernel by measuring its moving front on TRACE 1600 images and find that it has good temporal correlation with the line-of-sight velocity calculated from the H_α profiles using a wing bisect method. The maximum speed of the kernel measured from TRACE images is ~ 200 , which is similar to the chromospheric evaporation speed deduced from soft X-ray lines. We suppose that this kernel may be the plasma evaporated from the chromosphere. If this is true, it will be the first time to get direct evidence that supports the scenario of chromospheric evaporation and condensation of solar flares in Hα line as we know.

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