Signature of burst particle precipitation on VLF signals propagating in the Antarctic Earth‐ionosphere waveguide

摘要: The burst precipitation of energetic electrons (≥40 keV), induced by interactions with lightning-generated whistler mode waves, has been observed to cause phase and amplitude perturbations on subionospheric VLF signals (“Trimpi” events). With a knowledge the propagation characteristics signal, analysis perturbation details can lead estimates energy, extent, location precipitation. Trimpi events have propagating at high latitudes (L ≥ 4) over Antarctica, 3.79-kHz transmitted from horizontal dipole Siple station. A theory computer model for waves in Antarctic Earth-ionosphere waveguide is used illustrate as they propagate toward receivers Halley South Pole stations. To simulate effects precipitation, localized depressions ionospheric reflection height are introduced great circle paths model, it seen that, while some specific accurately reproduced, large positive (up 6 dB) Trimpi cannot be reproduced. Calculations presented which show that echoing patches located away path could such signatures.