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How or why do radio waves reflect the ionosphere?

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The radio window consists of frequencies which range from about 5 MHz (5 million hertz) to 30 GHz (30 billion hertz). read more

When the electromagnetic wave (or radio signal) propagates in plasma (the ionosphere is plasma), the free electrons start to oscillate depending on the frequency of the wave. If the frequency is low, the electrons oscillate slowly resonating with the frequency of the signal. read more

The screen, like the ionosphere, reflects the low energy AM radio waves and they are not detectable. Below is an animation comparing the ionospheric conditions during a typical day with that of a day containing an ionospheric storm. read more

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