How can high geomagnetic activity benefit radio communications?
Creates auroras that can reflect VHF signals✓الإجابة الصحيحة
Increases signal strength for HF signals passing through the polar regions
Improve HF long path propagation
Reduce long delayed echoes
الشرح
Particle precipitation during high geomagnetic activity creates dense auroral ionisation at E region heights, and that ionisation can return VHF signals that would otherwise pass into space, giving auroral contacts on 6 and 2 meters. The same activity degrades rather than improves HF paths through the polar regions.