Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jkas...28...77l&link_type=abstract
Journal of the Korean Astronomical Society, vol. 28, no. 1, p. 77-87
Astronomy and Astrophysics
Astronomy
1
3B Flare, Balmer Lines, Physical Characteristics
Scientific paper
An attempt has been made to analyze time series of H_alpha, H_beta and H_gamma line profiles taken from a 3B/X6.1 flare which occurred on Oct. 27, 1991 in an active region, NOAA 6891. A total of 22 sets of H_alpha, H_beta and H_gamma taken with a low and non-uniform time resolution of 10-40 seconds were scanned by PDS with absolute intensity calibration to derive the physical characteristics of the material in the flare chromosphere. Our results are as follows: (1) The lower Balmer lines observed during the flare activity are broadened by Stark effect. (2) At the peak of the flare activity, the electron temperature of the Balmer line emitting region reaches up to 35000K and its geometrical thickness increases to a scale of - 10E4 km, suggesting that high energy particles penetrate deep into the photospheric level.
Lee Sang-Woo
Yun Hong Sik
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