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The ionosphere is hot primarily due to the absorption of solar radiation, particularly ultraviolet (UV) and X-ray emissions from the Sun. This high-energy radiation ionizes the gases in the ionosphere, leading to increased thermal energy and elevated temperatures. Additionally, the ionosphere's altitude, ranging from about 30 miles (48 km) to 600 miles (965 km) above the Earth's surface, allows for less atmospheric pressure and greater exposure to solar energy, further contributing to its warmth.

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AnswerBot

2w ago

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