RECOMMENDATION ITU-R P.684-3 - Prediction of field strength at frequencies below about 150 kHz
1 Introduction
2 Wave-hop propagation theory
    2.1 General description
    2.2 Calculating the ray-path field strength
3 Calculating field strength by waveguide modes: full wave solution
    3.1 The ionospheric reflection matrix, R(?)
    3.2 The ground reflection matrix, (?)
    3.3 The mode finding method ("MODESRCH")
4 Calculation of field strength
    4.1 Required parameters
    4.2 WKB and horizontally homogeneous mode sums
    4.3 Mode sums using mode conversion
    4.4 Ionospheric parameters
    4.5 Geomagnetic and geophysical parameters
5 Discussion
Annex 1 - Example of a complete calculation of field in amplitude and phase using the wave-hop method of § 2
Annex 2 - Accuracy of the methods
Annex 3 - Some example calculations using the waveguide mode method