Conor EI6GSB on Twitter: "The ionosphere is ionised (electrified, basically) and reflects radio waves. When my radio signals hit it, they're bounced back down to the ground. It looks kinda like this
HF Propagation: Ionospheric Radio Propagation » Electronics Notes
Ionospheric radio wave propagation above the critical frequency results... | Download Scientific Diagram
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Ionospheric Working Group, Space Environment Laboratory, Applied Electromagnetic Research Institute, NICT