Jul 14 The propagation of mixed polarization VLF (f = 5 kHz or less) radio waves in the Antarctic earth-ionosphere waveguide
Jul 14 Measurements of Siple transmitter signals on the DE 1 satellite – Wave normal direction and antenna effective length
Jul 14 Very-low frequency signals (2-10 kHz) received at Palmer Station, Antarctica, from the 21.4 km dipole antenna at Siple Station, 1400 km distant