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Attenuation coefficients for propagation under SID conditions are deduced from records of atmosphe~ic noise, for the freq uen~y range of 3.5 to 50 kilocycles per second. These are compared wIth t he values under normal daytime circumst ances. It is shown that the advent of SID implies little change .in attenuation between a bout 12 and 20 kilocycles per second ; above thIS range t here IS a markedly decreased attenuation while below 12 kilocycles per second t here is an even more pronounced increase in the ~ttenuation coeffici ell ts.. The principle. of a~ impr<;lved r ec<;lrder of the changes in atmospheric noise associated WIth SID condItIOns IS outlIned; thIS recorder would discriminate between source effects indepcndent of the SID an d propagation influences solely attributable to the SID.

Attenuation coefficients for propagation at very low frequencies (VLF) during a sudden ionospheric disturbance (SID)