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(a) The observed variations of the conductivity-corrected aσ geomagnetic indices with fraction of year, F, shown as means in 36 equal-sized bins in F as a fraction of their overall mean. In all panels, red lines are for the northern hemisphere index, blue for the south and black for the average of the two. (a) aσcc(dawn)(F))/(〈aσcc(dawn)〉all; (b) aσcc(noon)(F))/(〈aσcc(noon)〉all; (c) aσcc(dusk)(F))/(〈aσcc(dusk)〉all; and (d) aσcc(midn)(F))/(〈aσcc(midn〉all.
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