Physical Parameters of a Flare on 22 December 1999 Derived from the Hα Line with a Modified Cloud Method

Details Physical Parameters of a Flare on 22 December 1999 Derived from the Hα Line with a Modified Cloud Method Physical Parameters of a Flare on 22 December 1999 Derived from the Hα Line with a Modified Cloud Method

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001soph..200..127l&link_type=abstract

Solar Physics, v. 200, Issue 1/2, p. 127-136 (2001).

Physics

4

Scientific paper

The flare of 22 December 1999 was observed in the Hα line using the imaging spectrograph in the solar tower of Nanjing University. We present a new technique different from the classical cloud model to fit the Hα line profile which avoids using the background profile. We obtain the four parameters of the flare chromosphere: the source function, the optical thickness at line center, the line-of-sight velocity and the Doppler width. The observed asymmetry profiles have been reproduced well by the theoretical ones based on our model. A discussion is made about the reliability of the results we have obtained using the present method.

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