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This specialized meeting was held in Ottawa, Canada, under the sponsorship of the International Union of Geodesy and Geophysics (IUGG), the International Association of Geomagnetism and Aeronomy (IAGA), and the Government of Canada, August 22–28, 1974, and followed the first workshop held in Edinburgh, Scotland, in 1972. The impetus for these meetings has come through in IAGA working group whose membership overlaps largely with the organizing committee. About 110 scientists participated in the Ottawa workshop, and a large majority attended all sessions.