![]() During daytime, the ionospheric D-region (at an altitude of 60 km - 90 km) acts as the upper boundary of the EIWG, whilst at night the D-region becomes much weaker and the boundary moves to higher altitudes. Very low frequency (3 kHz - 30 kHz) radio waves propagate thousands of kilometres in the Earth-Ionosphere Waveguide (EIWG) formed between the conducting Earth and the ionosphere. This paper describes the set-up of the narrowband system and demonstrates its capabilities with data from a set of solar flares on 08 February and 12 February 2010. VLF waves propagating through the Earth-Ionosphere Waveguide are excellent probes of the varying properties of the lower region of the ionosphere. VUniversity of KwaZulu-Natal, Durban, South AfricaĪ narrowband receiver was installed at the SANAE IV base in Antarctica to monitor specific very low frequency (VLF) radio signals from transmitters around the world. IVSANSA Space Science, Hermanus, South Africa ![]() IIIHeliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, USA IIDepartment of Electrical and Computer Engineering and Center for Space Physics, Boston University, Boston, USA ![]() ![]() ISpace and Plasma Physics, Royal Institute of Technology, Stockholm, Sweden Collier IV,V Etienne Koen I,IV Stephen Meyer IV,V Hanna Dahlgren I,II Torbjörn Sundberg I,III Andrew B. Solar flares detected by the new narrowband VLF receiver at SANAE IV ![]()
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