Journal Article

A Study on Red Asymmetry of Hα Flare Ribbons Using a Narrowband Filtergram in the 2001 April 10 Solar Flare

Ayumi Asai, Kiyoshi Ichimoto, Reizaburo Kitai, Hiroki Kurokawa and Kazunari Shibata

in Publications of the Astronomical Society of Japan

Published on behalf of Astronomical Society of Japan

Volume 64, issue 1 Published in print February 2012 | ISSN: 0004-6264
Published online February 2012 | e-ISSN: 2053-051X | DOI: https://dx.doi.org/10.1093/pasj/64.1.20
A Study on Red Asymmetry of Hα Flare Ribbons Using a Narrowband Filtergram in the 2001 April 10 Solar Flare

More Like This

Show all results sharing these subjects:

  • Astrometry and Celestial Mechanics
  • Solar Physics

GO

Show Summary Details

Preview

We report on a detailed examination of the “red asymmetry” of the H[math] emission line seen during the 2001 April 10 solar flare by using a narrowband filtergram. We investigated the temporal evolution and the spatial distribution of the red asymmetry by using H[math] data taken with the 60-cm Domeless Solar Telescope at Hida Observatory, Kyoto University. We confirmed that the red asymmetry clearly appeared all over the flare ribbons, and the strong red asymmetry is located on the outer narrow edges of the flare ribbons, with a width of about 1[math]5–3[math]0 (1000–2000 km), where strong energy releases occur. Moreover, we found that the red asymmetry, which also gives a measure of the Doppler shift of the H[math] emission line, concentrates on a certain value, not depending on the intensity of the H[math] kernels. This implies not only that the temporal evolutions of the red asymmetry and those of the intensity are not synchronous in each flare kernel, but also that the peak asymmetry (or velocity of the chromospheric condensation) of individual kernel is not a strong function of their peak intensity.

Keywords: acceleration of particles; Sun: chromosphere; Sun: corona; Sun: flares

Journal Article.  4811 words.  Illustrated.

Subjects: Astrometry and Celestial Mechanics ; Solar Physics

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content. subscribe or login to access all content.