Analysis of 2-d flare spectra: Velocity fields derived from Hα line asymmetries

Details Analysis of 2-d flare spectra: Velocity fields derived from Hα line asymmetries Analysis of 2-d flare spectra: Velocity fields derived from Hα line asymmetries

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995soph..158...81d&link_type=abstract

Solar Physics, Volume 158, Issue 1, pp.81-93

Physics

17

Scientific paper

We derive a time series of two-dimensional velocity fields for a flare region on 1992 December 16, based on the asymmetries of the Hα line. The Hα spectra were obtained by an imaging spectrograph at the Solar Tower Telescope of Nanjing University. Four sites with evident chromospheric downflows are found to appear and decay consecutively in the studied region. The value of maximum velocities is 30 40 km s-1 and the lifetime of downflows is 2 3 min at these sites. It is also shown that the asymmetries only exist at the line wing, while the line center has nearly no shifts for this flare. Finally, we make a discussion on the characteristics of the velocity distribution and its correlations with the intensity distribution, as well as with the hard X-ray emission.

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