Fluid motions in the solar chromosphere-corona transition region. I - Line widths and Doppler shifts for C IV

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Abstract

Matrices of line profiles for C IV, λ1548, observed with a 3" aperture and sampled in 3" intervals in active and quiet solar regions, show a pronounced tendency for line width to increase with increasing redshift. The correlation between increasing central intensity of the line and increasing redshift demonstrated by some authors is clearly present in these data but is weakened by the not infrequent occurrence of regions of strong redshift but with low intensity. Sunspots show both systematically narrower line profiles over umbral areas and strong redshifts on their Sun-center side. The latter result is consistent with a reverse Evershed effect.

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