Dynamics of the microwave brightness distribution along flaring loops

V. Melnikov

V.E. Reznikova, K. Shibasaki

Nobeyama Radioheliograph provides us with unique data about radio brightness distribution along flaring loops. In particular, we have found for several events, with extended loop-like sources well resolved with NoRH, that the brightness distribution along a loop changes in the course of simple emission peaks. On the initial rising phase of a peak (up to 0.1 – 0.4 of amplitude) brightness maxima are located near the loop foot points. Then, on the end of the rising phase and/or on the decay phase we see a single brightness maximum near the top of a flar-ing loop. This finding imposes important new constraints on the microwave emission models, as well as on the acceleration/injection and transport of mildly relativistic electrons in solar flares.