Abstract
Abstract The sunrise and sunset effects on the level of atmospherics on 27 kc/s are studied for the I.G.Y. and the I.G.C. periods at a tropical station. The two effects are not observed to be symmetrical. The latest limit of the beginning and the earliest limit of the end of the sunrise fall occur about 10 min after ground sunrise at the station. A simple explanation is offered for this, which also explains the other limits of the start and the end of the sunrise fall. In the case of the sunset rise the start is seen to take place almost always after ground sunset. In summer frequently a dip in activity is observed near ground sunset. Both these are responsible for the asymmetry. On the average the fall from the day side obeys a cosine law up to the minimum after which there is a steep rise for one hour, followed by a sudden change in the slope to a low value.
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