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(a) The observed variations of the geomagnetic indices with fraction of year, F, shown as means in 36 equal-sized bins in F as a fraction of their overall mean: (red) an(F)/〈an〉all; (blue) as(F)/〈as〉all; and (black) am(F)/〈am〉all. (b) The variations after correction for conductivity effects: (red) ancc(F)/〈ancc〉all; (blue) ascc(F)/〈ascc〉all; and (black) amcc(F)/〈amcc〉all. The deviations of an and as from am, (red) Δan = an − am, (blue) Δas = as − am, which for these variations with F are taken to be due to conductivity effects alone. (d) The variations of (red points) Δan and (blue points) Δas as a function of the mean dipole tilt angle, ψ for the same F-UT. The black lines in (d) are 4th-order polynomial fits to the points that are used to correct an to ancc and as to ascc, using equations (6) and (9), respectively.
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