The preliminary results obtained with the solar extreme ultraviolet spectrometer , onboard the Solar and Heliospheric Observatory ( SOHO ) , are reported on . The solar ultraviolet measurement of emitted radiation ( SUMER ) instrument established a long time series of the network evolution in following the solar rotation . The maps of the network evolution were obtained in lines spanning from 10(sup 4 ) K to 6 x 10(sup 6 ) K. Line profiles were also recorded with a sampling of 1 x 0.76 sq arcsec over the entire field . The progress analysis of this set of data is underlined and the velocity distribution in the cell network is considered .