Assertion: sunspot's form | /r/HasProperty | dependent
Facets:
value: very
type: DEGREE
value: upon the state of the ionosphere
type: OTHER
Source sentences:
text: HF radio communications of various forms including two way radio communications, maritime mobile radio communications, radio broadcasting, amateur radio communications, and in fact any form of radio communications that uses the HF bands and ionospheric radio propagation is very dependent upon the state of the ionosphere.