Letter to the Editor
Multi-line two-dimensional spectroscopy of a limb flare
S.Y. Yin and
Received 2 June 1999 / Accepted 13 July 1999
We present the result of a preliminary analysis of the 2D spectra of H and Ca II for a limb flare on 11 November, 1998. Near the top of the flaring loop, the H line is extraordinarily broadened. The effect of line opacity (or the saturation of line core) cannot fully account for the observed line width since it requires an extremely high loop density ( cm-3 when K). The remaining possibility is the broadening by micro-turbulence or inhomogeneous mass motions. Since the two lines demonstrate different broadening effects, it is quite possible that they are formed in different fine structures which cannot be spatially resolved by observations.
Key words: line: profiles Sun: flares Sun: prominences
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© European Southern Observatory (ESO) 1999
Online publication: July 26, 1999