The Red-Asymmetry Distribution at Hα Flare Kernels Observed in the 2001 April 10 Solar Flare

Details The Red-Asymmetry Distribution at Hα Flare Kernels Observed in the 2001 April 10 Solar Flare The Red-Asymmetry Distribution at Hα Flare Kernels Observed in the 2001 April 10 Solar Flare

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh13a1134a&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH13A-1134

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7507 Chromosphere, 7519 Flares, 7524 Magnetic Fields, 7554 X Rays, Gamma Rays, And Neutrinos

Scientific paper

We report a detailed examination about the evolution of the Hα flare kernels during an X2.3 solar flare which occurred on 2001 April 10. The Hα red-asymmetry, that is, the red-shifted Hα emission, is observed at almost all Hα flare kernels, during the impulsive phase of the flare. At Hα kernels nonthermal particles and/or thermal conduction precipitate into the chromospheric plasma, and this is thought to lead the downward compression of the chromospheric plasma, which is observed as the reddening of Hα emission (e.g. Ichimoto & Kurokawa 1984). We examined the evolution of the flare kernels inside the flare ribbons by using the Hα images obtained with the Domeless Solar Telescope at Hida Observatory, Kyoto University. We also examined the spatial distribution of the Hα kernels which show the red-asymmetry and their relationship with the intensity of the Hα kernels. We found that the stronger the red-asymmetry is, the brighter the Hα kernel is. Then, we compared the strengthes of the Hα red-asymmetry at hard X-ray emitting sources with those at the Hα kernels without the hard X-ray emissions.

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