Radio waves do not penetrate in the band of
Ionosphere
Mesosphere
Troposphere
Stratosphere
The ionization of gas particles in the ionosphere helps in the transmission of radio waves by reflecting waves back to Earth, rather than allowing them to escape the atmosphere. Solar flares, the spontaneous eruption of high-energy radiation from the surface of the sun, can cause a sharp increase in the number of ionized particles in the upper atmosphere and can interfere with radio wave transmissions.
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