Extra exam question E3C08
Subelement E3, RADIO WAVE PROPAGATION· Group E3C
E3C08
Which of the following is the space-weather term for an extreme geomagnetic storm?
- A.B9
- B.X5
- C.M9
- D.G5 (correct answer)
WhyG5 is the space-weather term for an extreme geomagnetic storm. The space-weather scale for geomagnetic storms runs from G1 (minor) to G5 (extreme), so G5 is the term used for the most severe category of geomagnetic storm, answer D. X5 and M9 describe solar flare intensity on a completely separate scale, and B9 isn't part of any standard space-weather classification.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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