Rorden, LH 1965Mlodnosky, RF, Rorden, LH Daytime Whistler-Mode Attenuation through the Lower Ionosphere at 15.5 Kc as Measured on Explorer VI during Launch Trajectory 1963Rorden, LH, Smith, RL An Interpretation of LOFTI-I very-low-frequency observations, AGARDOGRAPH 74 PDF (Online Viewing) 035.pdf