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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 ionosphere and auroras. The upper part of the mesosphere, and most of the thermosphere, is also known as the ionosphere, 80â400 kilometres above the earthâs surface. The air becomes noticeably ionised (electrically charged), caused mainly by ultraviolet light from the sun.he aurora can even be seen north of Auckland during active times. The next period of maximum solar activity should occur in 2012 or 2013. This will be a good time to look out for the waving curtains and moving rays.