ULF wave attenuation in the high latitude ionospheric waveguide Original Research Article

The propagation and attenuation of isotropic fast mode waves parallel to the Earthʹs surface in the ionospheric F2 region waveguide have been observed as Pc 1–2 (0.1–5 Hz) geomagnetic pulsations by a network of three closely spaced stations at Davis, Antarctica. The wave properties observed are consistent with fast mode wave propagation with phase velocities of 300–800 km s−1, close to the Alfven velocity at these heights. Attenuation across the network is in the range 10–95 dB/1000 km with a 1e folding distance of 310±220 km and are higher than attenuation at low and middle latitudes.