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��
����� 2.8Loss 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: Lt��������
�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����