Assertion: radio wave's frequency | /r/CreatedBy | the d region
Facets:
value: in the ionosphere
type: LOCATION
Source sentences:
text: Sky-wave ionospheric propagation is not possible during the day because of the attenuation of the signals on these frequencies caused by the D region in the ionosphere.
text: Sky-wave ionospheric propagation is not possible during the day because of the attenuation of the signals on these frequencies caused by the D region in the ionosphere.