caption: Communication with Satellites The atmosphere is relatively transparent to microwaves Microwaves are used for communication with satellites because ... Earth Ionosphere Microwaves can carry greater amounts of information than radio waves because of their high frequency compared with radio waves Radio waves with frequencies of less than 30 MHz are reflected by the ionosphere These are useful for long-distance ground- to-ground communication, however the ionosphere is affected by solar activity and it is therefore not a stable, reliable reflector.
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