CONSTRAINTS ON ELECTRON ACCELERATION/INJECTION FROM NoRH OBSERVATIONS

摘要

Nobeyama Radioheliograph microwave data provide us with unique information about radio brightness distribution along flaring loops. In particular it has been found for several events that the brightness maximum at 17 and 34 GHz is located at the top of extended flaring loops. The detailed analysis of these events strongly suggests that the distribution of mildly relativistic electrons along an extended flaring loop must be highly inhomogeneous: accelerated electrons are concentrated in the upper part of the loop. This finding impose important new constraints on the acceleration/injection mechanisms and kinetics of high energy particles in solar flares.