E3C12 : Which of the following is indicated by a sudden rise in radio background noise across a large portion of the HF spectrum?
A
A temperature inversion has occurred
B
A coronal mass ejection impact or a solar flare has occurred
C
Transequatorial propagation on 6 meters is likely
D
Long-path propagation on the higher HF bands is likely
Correct Answer: A coronal mass ejection impact or a solar flare has occurred