Some microwave propagation experiences from a "Just-below-horizon" path

Based on comparisons between field strength records at 2300 mc and simultaneously measured
M
curves it is concluded that the most important propagation disturbances on the test path are caused by reflections from discontinuities in the refractive index profile. The occurrence probability for such discontinuities is shown to have a marked seasonal and diurnal period with a maximum in the summer and around sunrise.