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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.
(3) In the mesosphere, the air is relatively mixed together, so the temperature decreases with altitude. The atmosphere reaches its coldest temperature of around -90Â°C in the mesosphere. This is also the layer in which a lot of meteors burn up while entering the Earth's atmosphere.(4) The thermosphere is the fourth layer of the Earth's atmosphere.The air is really thin in the thermosphere.A small change in energy can cause a large change in temperature. That's why the temperature is very sensitive to solar activity.4) The thermosphere is the fourth layer of the Earth's atmosphere. The air is really thin in the thermosphere. A small change in energy can cause a large change in temperature. That's why the temperature is very sensitive to solar activity.