CONTENTS

Policy on Intellectual Property Right (IPR)     ii
RECOMMENDATION  ITU-R  P.1239-2     1
ITU-R reference ionospheric characteristics     1
Scope     1
Annex 1  Ionospheric characteristics     1
1 Introduction  1
2 Mapping functions  2
3 Prediction of foF2 and M(3000)F2  4
        3.1 Monthly median values  4
        3.2 Variability factors  5
4 Prediction of foE  5
5 Prediction of foF1  6
6 Prediction of foEs and fbEs  7
7 Prediction of h�F and h�F,F2  7
8 Prediction of the percentage of occurrence of spread-F  8
9 Available computer programs and reference data  8