Time-of-day/time-of-year response functions of planetary geomagnetic indices | Journal of Space Weather and Space Climate

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Fig. 17

Plots of fits to the ratio of am/ap as a function of time of year F and ap value for the 8 UT’s of the ap and am index samples, derived as described in the text so that they can be used to generate the corrected ap index, ap_C from ap.

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