A Comparison Between Fredericksburg and Planetary Geomagnetic A Values
Henry A. Adams
Jan 1975 · U.S. Department of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, [Space Environment Laboratory]
eBook
19
Pages
About this eBook
An initial comparison and an expanded study of A indices showed significant differences between Fredericksburg A values (A subscript FRED) and planetary A values (A subscript p), with Ap values higher than the corresponding AFRED value most of the time. A seasonal effect was observed with a greater difference between the indices during the winter than in summer. Because of the difference between the two indices, the Space Environment Services Center changed the geomagnetic forecasts to include estimates and forecasts of both geomagnetic indices. The Air Force Global Weather Central then developed a method of estimating and directly forecasting the planetary A index. The statistical results of this study can be used to insure a reasonable agreement in the forecasts of the two indices.
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