Basic Qualification · B-007 Radio wave propagation · B-007-005-003
What is solar flux?
- A The number of sunspots on the side the sun facing the Earth
- B The density of the sun's magnetic field
- C frequency energy
- D A measure of the tilt of the Earth's ionosphere on the side toward the sun
Correct answer: C — frequency energy. From the official ISED question bank, verified word for word.
Why
Solar flux measures the amount of radio frequency energy the Sun emits at a specific wavelength, acting like a brightness gauge for our star's radio output. The full explanation — and one for every question — is in Pro.
Practise this section
How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.