Ionospheric radio wave absorption in the auroral zone and the interplanetary magnetic field sector structure

Auroral radio absorption: The prediction question

“…The effect was greater at higher latitude, amounting to about a factor of 2 at the latitude of South Pole and Frobisher Bay. Mansurov et al (1976) found a dependence on IMF direction which was consistent with this observation in their analysis of A1 (pulse absorption) measurements at Murmansk. There is also an inter-hemispheric effect, the ratio between the absorption at Frobisher Bay and South Pole being larger when the IMF is away from the Sun (Hargreaves and Cowley, 1967b), this effect being significant only at the higher latitude and in the night sector.…”