Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997cha%26a..21...99x&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 21, Issue 1, p. 99-106.
Astronomy and Astrophysics
Astrophysics
Scientific paper
This paper analyzes the spectrum of a Class 2N/X2.1 white-light flare obtained by the Nanjing University Solar Tower Multi-Wavelength Spectrograph on 1991-10-24 with a high time resolution (5s). A systematic comparison of the line profiles and continuum strength with the X-ray and radio burst data shows that the flare is a Type-I white-light flare with the following characteristics: 1) During the flare impulsive phase the central intensities of lines in different wavelengths, the continuum, the line half-widths, the red asymmetry of the wings and the hard X-ray burst at the high energy portion all reached maximum at the same time. 2) The Hα line had a half-width of 10 Å when the continuum emission reached maximum, and showed strong line reversal at the center. Hβ and Hγ also showed line reversal. 3) The five lines observed all showed clear red asymmetry, which lasted some 1 min. Based on these results, we find electron-beam bombardment, combined with chromospheric evaporation and condensation can provide a good qualitative interpretation of the energy storage and release of this white-light flare.
Cheng Fang
Ju Hu
Xi Zhou
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