A Microwave Imaging Observation of an Electron Stream in a Solar Flare by Nobeyama Radioheliograph

We report a Nob eyama Radioheliograph microwave observation in a flare of a propagating feature of non-thermal emission to propagate from one end of the loop to the other with a speed of 9 × 104 km s-1 . We interpret this microwave is emitted from streaming electrons. From the comparison of energies of the electrons that should emit the microwave with their observed apparent speed, we suggest that the high energy electrons possibly have large (> 70 degree) pitch angles when they are injected.