CONTENTS

 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           
Appendix 1    
 1     Hourly loss factor: L_t        
 2     Sunset and sunrise times   
Annex 1 - Accuracy of method    
Annex 2 - A discussion on daytime sky-wave propagation    
 1     LF cases    
 2     MF cases