RECOMMENDATION ITU-R P.1147-2 - Prediction of sky-wave field strength at frequencies between about 150 and 1 700 kHz
1 Introduction
2 Annual median night-time field strength
    2.1 Reference time
    2.2 Cymomotive force
    2.3 Sea gain
    2.4 Polarization coupling loss
    2.5 Slant propagation distance, p
    2.6 Loss factor incorporating effects of ionospheric absorption and related factors
    2.7 Hourly loss factor
    2.8 Loss factor incorporating effect of solar activity
3 Day-to-day and short-period variations of night-time field strengths
1 Hourly loss factor: Lt
2 Sunset and sunrise times
1 LF cases
2 MF cases