By H.E. Landsberg (ed.), J.Van Mieghem (ed.)

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Perhaps the most strik- FROM POLAR YEARS TO IGY 39 ing was the launching of the earth's first satellite vehicle, Sputnik I, on October 4, 1957. Sputnik I was followed by Sputnik 11, Explorer I, Vanguard, Explorer I11 and IV, and Sputnik 111. Launching dates and some of the geophysical measurements being made from the satellites are listed in Table VI. S. R. Embassy, 1958; Smithsonian Astrophysical Observatory, 1958; Whipple et al, 1958; Yatoukin, 1958). The information received from all satellite vehicles is now under analysis; however, from the preliminary statements already issued, no startling departures from anticipated values have yet been found below 1000 km.

S. to suggest (1950) the implementation of a Third International Polar Year (TPY). The envisioned international collaboration would not only provide increased knowledge of the globe, but would permit nations to join a common cause-the battle against geophysical ignorance. The plan was formally sponsored (Brussels, 1950) by the Mixed Commission on the Ionosphere, which proposed to the International Council of Scientific Unions that a Third Polar Year be undertaken 25 years after the SPY. The Council (Washington, 1951) recommended that further consideration be given the proposal by the International Unions of Astronomy (IUA) , Geodesy and Geophysics, Geography, Pure and Applied Physics (IUPAP), and Scientific Radio, and the World Meteorological Organization (WMO).

Investigation of coastal structure is being made through simultaneous land and sea measurements. Crustal strain accumulation is being measured in certain earthquake-prone zones. The FROM POLAR YEARS TO IGY 37 installation of new stations has been closely coordinated with all interested seismologists. The greatest number of new stations is located in Antarctica. 11. Solar Activity. , will be recorded a t a fair number of observing stations. The magnetic field pattern over the solar disk is being mapped daily.

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