An Approach to the Warning of Sudden Ionospheric Disturbances(SID) by Means of the Observations of Solar Microwave Bursts

Statistical analyses of the data of the radio bursts with seven frequencies,x-rays and the sudden short wave fade-out(SSWF) from January 1980 to October 1982 are carried out,and the warning effects have been checked by means of the data of the radio bursts with three radio frequencies of 2902 MHz,3653 MHz and 9375 MHz obtained at Yunnan Observatory from January 1980 to August 1982.Thus it is possible to warn the sudden short wave fade-out using the peak flux density of radio hursts with these three frequencies.