OCCURRENCE FREQUENCY OF MILLISECOND RADIO SPIKES AT 1.42, 2.84, 3.67 GHz DURING THE RISING PHASE OF SOLAR CYCLE 22

At present，we use the word "spike" introduced by de Groot, which is well established by the solar radio astronomers, and restrict it to narrowband peaks of less than 100 ms total duration. The duration of spikes, order of magnitude shorter than any other type of raido emission, led to their important discoveries, such as their high brightness temperature of up to 10¹⁵K, "strong" polarization to 100%, much small intrinsic bandwidth of 1.5% and small source of less than 200 km in diameter, etc.