Multiple and Partial Correlation between Atmospheric Noise Levels at Different Frequencies

Multiple and partial correlations between atmospheric noise levels at 105 kHz, 280 kHz, 1.6 MHz, and 2.9 MHz were examined. These provide a quantitative measure for the improvement in predicting the noise level at one frequency from the noise levels at a number of other frequencies rather than from that at just one frequency. The analysis also leads to the interesting result that atmospheric noise levels show properties of a Markov process in frequency domain.