Special fine structures of solar radio bursts on April 15 1998

The 2.60-3.80 GHz spectrometer in Beijing Astronomical Observatory (BAO) re corded two remarkable "decimetric pulsation" events (DCIM) around the time 1998 0415 0800 UT. High resolution dynamic spectra revealed various new fin e structures during the rising phase of the second DCIM, which seem differe nt from "zebra patterns" well known at lower frequencies. The high frequenc y limit of the second DCIM is delineated by 1 to 3 narrow and continuous em ission bands whose frequencies fluctuate in parallel, and which occasionall y split and merge. They look like the "evolving emission line" (EEL) report ed by Chernov et al. (1998) at lower frequencies. It is the second time tha t such a feature has been recorded, and the first time above 1 GHz.