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


  • W. M. Sherrill,

  • G. A. Smith


Visibility function analysis of sporadic-E mode fine structure was performed on a 830 km path between 10 and 14 MHz. Angular spectra derived show resolved doublet magnetoionic components with angular separation of 4.5 to 6 deg. Individual singlet components appear with 1 to 2 deg 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 2 deg core and halo distributions.