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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.
Temperatures within the thermosphere increase at higher levels until it becomes somewhat stable up to the thermopause, the end of the thermosphere and the beginning of the exosphere. In upper levels, the typical temperatures of the thermosphere are usually anywhere between 900 degrees and 3,600 degrees Fahrenheit. This temperature often is about 400 degrees Fahrenheit hotter during the day than at night.