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| Filed Under: Space Leave a Comment. The ionosphere layer of the atmosphere overlaps the mesosphere and thermosphere and is the uppermost part of the atmosphere. The temperature of the ionosphere ranges from about 200K, or -73 ÂºC (-99.4 ÂºF) to 500K, or 227 ÂºC (440.6 ÂºF).So basically at the bottom it is 200K. At the top it is 500K.K is in Kelvin.he temperature of the ionosphere ranges from about 200K, or -73 ÂºC (-99.4 ÂºF) to 500K, or 227 ÂºC (440.6 ÂºF). So basically at the bottom it is 200K. At the top it is 500K. K is in Kelvin.
The spectacular auroras form in the upper regions of the thermosphere. Within the thermosphere is a region known as the ionosphere, which extends from about 50 miles to 250 miles above the earth's surface. Within this region, free electron density is very great and distance from Sea Level affects radio communication.HE MESOSPHERE. The mesosphere is characterized by a marked increase in temperature. At a height of about 150,000 feet, the temperature reaches 10 C. The rise in temperature is due to the presence of a layer of ozone which absorbs more of the sun's radiation.