CONTENTS

Annex 1 - Ionospheric characteristics
1 Introduction
2 Mapping functions
3 Prediction of foF2 and M(3000)F2
        3.1 Monthly median values
        3.2 Variability factors
4 Prediction of foE
5 Prediction of foF1
6 Prediction of foEs and fbEs
7 Prediction of h�F and h�F,F2
8 Prediction of the percentage of occurrence of spread-F
9 Available computer programs and reference data