General exam question G3A06
Subelement G3, RADIO WAVE PROPAGATION· Group G3A
G3A06
What is a geomagnetic storm?
- A.A sudden drop in the solar flux index
- B.A thunderstorm that affects radio propagation
- C.Ripples in the geomagnetic force
- D.A temporary disturbance in Earth’s geomagnetic field (correct answer)
WhyA geomagnetic storm is a temporary disturbance in Earth's geomagnetic field. A geomagnetic storm is a temporary disturbance in Earth's own magnetic field, usually triggered by a burst of solar particles arriving from a flare or coronal mass ejection, answer D. It isn't a drop in solar flux, an ordinary thunderstorm, or literal ripples in some undefined "geomagnetic force," those aren't real descriptions of the phenomenon.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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