Fig. 11

Ionospheric primary (top) and secondary (bottom) radial magnetic field at radius \(a = 6{,}371.2~\text {km}\) during vernal equinox centered on noon local time for 06, 12, 18, and 00 UT. Contours show 5 nT increments and a value of \(F_{10.7} = 100.0\times 10^{-22} \mathrm{W}/\mathrm{m}^2/\mathrm{Hz}\) was used for evaluation