Observations of long wave radio bursts during powerful chromospheric events

Analysis results of long-wave radio bursts within 2160-540 kHz frequency range, recorded by means of PROGNOZ-2 satellite in April-May 1981 and connected with the development of solar high-power chromospheric flares, are presented. All the observed events may be divided into three main groups: 1)events, where III-type bursts coinside with flare explosive phase; 2)SA(shock accelerated) type burst events, delayed relatively to the explosive phase for several minutes; 3)events, characterized by absence of low-wave radio bursts at high-power chromospheric flares - according to the delay time of long-wave radio bursts relatively to the explosive phase of flares