The Day-to-Day Coordination of IGY Observations

The IGY World Days and Communications program has four facets: 1) an IGY Calendar of selected days for experiments which cannot be carried on continuously; 2) a scheme for specifying periods when phenomena of unusual interest are anticipated a few hours in advance; 3) the prompt and wide distribution of summary observations of outstanding solar and geophysical events; and 4) the use of the world-wide scientific communications network for processing information of temporal interest. This is a cooperative effort including all the countries participating in the IGY. The paper describes the plan and its execution, including the arrangements for rapid communications.