However they disturb the F - layer of the ionosphere , especially at middle and high geographical latitudes , causing a so - called ionospheric storm which degrades radio propagation .
Geomagnetic storms , indicated by a K = 5 or higher , have no direct effect on propagation .
They disturb the F - layer of the ionosphere , especially at middle and high geographical latitudes , causing a so - called ionospheric storm which degrades radio propagation .
Geomagnetic storms , indicated by a K = 5 or higher , have no direct effect on propagation .