Jul 14 Siple Station, Antarctica, experiments on staircase frequency ramps as approximations to continuous ramps
Jul 14 A multiple-mode three-dimensional model of VLF propagation in the earth-ionosphere waveguide in the presence of localized D region disturbances
Jul 14 Relaxation of transient lower ionospheric disturbances caused by lightning-whistler-induced electron precipitation bursts
Jul 14 The propagation of mixed polarization VLF (f = 5 kHz or less) radio waves in the Antarctic earth-ionosphere waveguide