2020-04-29T14:26:15.978Z foF2 124 Critical frequency of the F2 layer of the ionosphere. This critical frequency (f, in MHz) is associated with the electron density (Ne, in cm-3): f=9*10^-3*sqrt(Ne). Critical frequency of the F2 layer of the ionosphere. This critical frequency (f, in MHz) is associated with the electron density (Ne, in cm-3): f=9*10^-3*sqrt(Ne). foF2 124 3 2019-10-14T16:36:30.652Z https://api.github.com/users/kurt-hectic kurt-hectic 2020-04-29T14:25:36.344Z