Outflow Velocities at the Base of a Polar Coronal Hole During the 1998 Total Eclipse
Vial, J. -C.; Koutchmy, S.; Patsourakos, S.; Schühle, U.; Gabryl, J. -R.
France, Belgium, Germany
Abstract
Polar coronal holes represent the most convincing site from which the high-speed solar wind originates. Here we report high-accuracy Doppler shifts measured in the O VI (1037.6 Å) line obtained by SUMER on SOHO inside an interplume region within the south polar coronal hole. We infer limits on the outflow velocity and draw hints about the flow geometry.