Calculated and observed photoelectron-flux spectra at dawn

Solar EUV flux variation during a solar cycle as derived from ionospheric modeling considerations

“…In the recent literature there has been considerable discussion of whether or not the magnitude of the solar EUV flux for wavelengths X < 1025 /•, as measured by Hinteregger [1970], is sufficient for modeling ionospheric processes [e.g., Swartz and Nisbet, 1973;Robie and Dickinson, 1973;Prasad and Furman, 1974;Heroux et al, 1974;Nisbet, 1975;Ciderone, 1974;Cicerone et al, 1973;Myers et al, 1975]. Some authors argue that a doubling of Hinteregger's flux measurements is necessary to obtain agreement between theoretical calculations and observations; others disagree.…”