Correlation Between Solar Radio Bursts and Sudden Frequency Deviation Events

摘要

Solar radio bursts observed at 606, 1415, 2695, 4995 and 8800 MHz have been correlated with Sudden Frequency Deviations (SFD) measured at Boulder, Colorado, in the signals of WWI originating in Havana, Ill. The correlation reaches a not very pronounced maximum near 5000 MHz, and it is higher for stronger events (both large bursts and large SFD's). It increases monotonically with the size of the SFD's correlated with radio bursts observed on centimeter wavelengths, but shows a decrease for SFD's of intermediate size correlated with bursts observed in the decimeter region. Of the five frequencies (8.9, 9.9, 11.1, 12.1 and 13.0 MHz) of WWI used to measure SFD's over the above mentioned ray path, the correlation of the events observed at 9.9 MHz was less than half the mean correlation value obtained from the other four frequencies. The correlation was high for radio bursts with a maximum in the range between 1000 and 5000 MHz and low for radio bursts with intensity spectrum decreasing with frequency in the range from 606 to 8800 MHz. The results are also compared with a similar correlation analysis between solar radio bursts and SCNA events. (Author)