Basic Qualification · B-007 Radio wave propagation · B-007-007-007
Dans l'hémisphère nord, dans quelle direction devrait-on orienter l'antenne directionnelle pour profiter au maximum de l'activité aurorale?
- AVers l'ouest
- BVers le sud
- CVers le nord
- DVers l'est
Correct answer: C — Vers le nord. Question tirée de la banque officielle d'ISDE.
Why
Auroral propagation happens when radio waves bounce off the glowing ionized gases in the sky caused by solar particles hitting Earth's magnetic field. The full explanation — and one for every question — is in Pro.
Practise this section
Radio wave propagation is section B-007 of the Basic exam: How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.
Drill B-007 — free, no account