Cosmic noise absorption measurements at Stanford, California, and Pullman, Washington

Results of cosmic noise absorption measurements at 27.5 Mc made at Stanford, California, and Pullman, Washington, during 1958 are presented. A method introduced by Mitra and Shain of extracting F-layer absorption from total absorption and an extension of this method to remove D-layer absorption are described. Subtracting these two components from the total absorption leaves an extra component of absorption. The diurnal and annual variation of all these components is presented graphically and discussed. Errors in the cosmic noise curves are discovered and corrected for. The cause of these errors and its relation to assumptions of the cosmic noise absorption method is discussed.