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US amateur tries to work those European stations there is no reply
whatsoever. The Europeans are unable to hear the US stations. This
propagation anomaly causes the radio wave to travel different paths
dependent on which direction it travels, i.e. an east–west signal is not
necessarily the reciprocal of a west–east signal. This anomaly can
occur when a radio signal travels through a heavily ionized medium
in the presence of a magnetic field, which is exactly the situation when
the signal travels through the ionosphere in the presence of the Earth’s
magnetic field.
References
Belcher, R. et al. (1989). Newnes Mobile Radio Servicing Handbook. Butter-
worth-Heinemann, Oxford.
Kennedy, G. (1977). Electronic Communications Systems. McGraw-Hill Koga-
shuka, ...