BIG LOOP PROMINENCE SYSTEM AT THE WEST LIMB OF SOLAR DISK ON THE DAYS 15 TO 17,AUG.IN 1989

Using the 18 cm Hα-Photoheliograph at Yunnan Observatory,we obtained theAR5629(S17,L75)data.The AR existed at the southern hemisphere of solar disk duringthe days from Aug.4 to 16.Except Aug.16th when the AR partly moved away from thedisk,sunspot group type was HRX,the AR kept its complex type in McIntoshclassfication on the other 12 days and there were 8 days,spot group areas over 1,000 units(1 unit=10^-6Hemi¹).