Structure and Dynamics in the Atmosphere Above Sunspot Regions
Kjeldseth-Moe, O.; Haugan, S. V. H.; Brekke, P.; Brynildsen, N.; Maltby, P.; Wikstøl, Ø.
Norway
Abstract
Based on simultaneous observations of 10 EUV emission lines with the Coronal Diagnostic Spectrometer - CDS on the Solar and Heliospheric Observatory - SOHO we study the spatial distributions of both line emission and line-of-sight velocity in the atmosphere above 17 sunspots. We find that both the enhanced EUV line emissions and the velocities are distributed non-uniformly over the sunspot regions. Areas with enhanced line emission tend to be red shifted, but they seldom coincide exactly with areas with enhanced velocity. Bright sunspot plumes with motion directed away from the observer are observed in most of the sunspot regions