In this paper we compare the long-term impulsive microflares (microbursts (MB) in the range 1000 MHz) using RATAN-600 observations and impulsive noise storm (NS) emission on frequencies 233 and 164 MHz using Nancay radioheliograph data. It is shown that these processes result from destruction of current sheets at the top of a coronal loop as a result of the development of plasma instability sequences. The coincidence in time between the generation of microbursts and coronal mass ejections is of special interest. The impulses of NS radio emission at meter waves arise after the appearance of the MB at decimeter waves. The temporal parameters of the processes are determined. It is shown that the MB duration is determined by the spreading time of the magnetic flux in the reconnection region along the current sheet. The flux of energy in the form of fast electrons is equal to 9.2¿104 ergs cm-2 s-1. ¿ 2001 American Geophysical Union