Auroral electrojet magnetic activity indices AE (11) for 1972

The Auroral Electrojet index (AE) is discussed and a brief description is given of the derivation of 11-station 2.5-min AE indices for 1972. Tables are given of hourly average indices for each date of the year, the stations making the main contribution to the hourly indices, and of the average monthly quiet-time level of horizontal fields (H) at each magnetic discovery. Graphs of the index variations are included for each day of 1972. by Joe Haskell Allen, Carl C. Abston and Leslie D. Morris ; National Geophysical and Solar-Terrestrial Data Center, Environmental Data Service. Chiefly tables. Subscription price: $25.20 a yr., foreign $37.20. Also available via the Internet. 1975 NESDIS (National Environmental Satellite, Data, and Information Service) Library Public Domain 2286