Question E3C12
From subelement E3 - E3C
E3C12
Answer: BWhich of the following is indicated by a sudden rise in radio background noise across a large portion of the HF spectrum?
AA temperature inversion has occurred
BA coronal mass ejection impact or a solar flare has occurred
CTransequatorial propagation on 6 meters is likely
DLong-path propagation on the higher HF bands is likely