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

摘要: Abstract Radio signals transmitted from the unique experimental VLF transmitter at Siple Station (76°S, 84°W), Antarctica, as well communication and navigation systems waves that propagate in ionosphere magnetosphere whistler mode, are regularly received analysed Palmer (65°S, 64°W), Antarctica. The amplitude polarization properties of predicted using a ray optics analysis. signal varies with frequency; observed nulls spectrum, where thesignal amplitude/alls 5–10 dB below what might be expected, explained by spectrum is to very sensitive ionospheric conditions. Whereas arrival bearings transmitters other than found within 5° their expected values, which consistent vertical operation DF system, an approximately 90° anomaly apparent bearing attributed essentially horizontal signal. theory system. Occasional anomalies greater terms combination error smaller multi-path error. two-hop whistlers propagating on common magnetospheric path showed end point 200km Siple. This suggests these were polarization.