Physics Dept., NJIT, University Heights, Newark, NJ 07102

We present the result of analysis of microwave burst spectra obtained with the OVRO Solar Arrays and discuss it in relation to the topic of the magnetic trapping of flare-produced electrons. In this approach we first distinguish the events seemingly dominated by Coulomb collision (weak diffusion case) from others (strong diffusion case) by looking at their observed spectral variations. We then use appropriate time-dependent Fokker-Planck solutions in calculation of microwave emissivity taking into account magnetic quantities of the flaring loops as obtained from the coronal field extrapolations. Comparison of such theoretical spectral variations with observed ones mainly provides information on injection parameters such as time scales of injection and initial beam widths of electrons.