HR: 1340h
AN: SH13A-1134    [Abstracts]
TI: The Red-Asymmetry Distribution at H$\alpha$ Flare Kernels Observed in the 2001 April 10 Solar Flare
AU: * Asai, A
EM: asai@nro.nao.ac.jp
AF: Nobeyama Solar Radio Observatory, NAOJ, Minamisaku, Nagano, 384-1305 Japan
AU: Ichimoto, K
EM: ichimoto@solar.mtk.nao.ac.jp
AF: National Astronomical Observatory of Japan, Mitaka, Tokyo, 181-8588 Japan
AU: Shibata, K
EM: shibata@kwasan.kyoto-u.ac.jp
AF: Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto, 607-8471 Japan
AU: Kitai, R
EM: kitai@kwasan.kyoto-u.ac.jp
AF: Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto, 607-8471 Japan
AU: Kurokawa, H
EM: kurokawa@kwasan.kyoto-u.ac.jp
AF: Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto, 607-8471 Japan
AB: We report a detailed examination about the evolution of the H$\alpha$ flare kernels during an X2.3 solar flare which occurred on 2001 April 10. The H$\alpha$ red-asymmetry, that is, the red-shifted H$\alpha$ emission, is observed at almost all H$\alpha$ flare kernels, during the impulsive phase of the flare. At H$\alpha$ 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 H$\alpha$ emission (e.g. Ichimoto & Kurokawa 1984). We examined the evolution of the flare kernels inside the flare ribbons by using the H$\alpha$ images obtained with the Domeless Solar Telescope at Hida Observatory, Kyoto University. We also examined the spatial distribution of the H$\alpha$ kernels which show the red-asymmetry and their relationship with the intensity of the H$\alpha$ kernels. We found that the stronger the red-asymmetry is, the brighter the H$\alpha$ kernel is. Then, we compared the strengthes of the H$\alpha$ red-asymmetry at hard X-ray emitting sources with those at the H$\alpha$ kernels without the hard X-ray emissions.
DE: 7500 SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY
DE: 7507 Chromosphere
DE: 7519 Flares
DE: 7524 Magnetic fields
DE: 7554 X rays, gamma rays, and neutrinos
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting