Directional dispersion of sporadic-E modes between 9 and 14 MHz

Visibility function analysis of sporadic-E mode fine structure was performed on an 830 km path between 10 and 14 MHz. Angular spectra derived show resolved doublet magnetoionic components with angular separation of 4.5 to 60. Individual singlet components appear with 1 to 20 angular width. Compared to other mode fine structure data, these results indicate increased azimuth spread and multiple lines predominate on paths less than 1000 km, while longer paths more nearly conform to 1 to 20 core and halo distributions