FIRST OBSERVATIONS OF CORONAL HOLE STRUCTURE AND EVOLUTION USING SOHO-CDS

We report on initial observations of coronal hole structure and evolut ion by the Coronal Diagnostic Spectrometer (CDS) instrument on board t he Solar and Heliospheric Observatory (SOHO). The data show that there is coronal activity on time scales of tens of minutes, manifested as brightenings at chromospheric network cell junctions in extreme ultrav iolet (EUV) wavelengths. There are also significant differences in str ucture seen in different wavelengths in coronal holes. Finally, we sho w coronal hole EUV spectra and compare them to quiet-Sun spectra, also taken by CDS.