AR5629:THE OBSERVATIONS OF THE FLARE LOOP OF AUG.17,1989

Using the Solar Magnetic Field Telescope of Huairou Solar Station,we observed theflare loop occuring on the west limb of the sun on Aug.17,1989.The loops were causedby AR5629(S17,L74).At that time,this active region had already gone to the back ofthe sun,about 10°.From UT0132 to UT0911,we got the data of the flare images(Fig.l) and their relevant two dimensional real-time line of sight velocity fields(Fig.2) in Hβ.