EUV and Radio Observations of an Equatorial Coronal Hole

摘要

An equatorial coronal hole has been observed on 18 and 19 October 1996 with SOHO-CDS and with the Nancay Radioheliograph (RH). The CDS EUV line intensities are used to determine the coronal hole Differential Emission Measure (DEM); in turn this is used to compute the radio brightness temperature T_b at the observed frequencies, leaving the coronal electron temperature and density as free parameters. EUV line intensities, calculated from the derived models, show a good agreement with EUV observations.