non-great-circle propagation

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Term: non-great-circle propagation

Describing a degraded condition of radio propagation caused by horizontal gradients in ionospheric electron density. The radio wave is refracted away from its normal great-circle path, which is the shortest distance between two points on Earth. Strong horizontal gradients are associated with the equatorward boundary of the auroral oval (especially in the night sector) and the sunrise terminator.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan