Question

why is the upper part of the thermosphere is called inosphere​

Answer 1

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The ionosphere is a very active part of the atmosphere, and it grows and shrinks depending on the energy it absorbs from the Sun. The name ionosphere comes from the fact that gases in these layers are excited by solar radiation to form ions, which have an electrical charge.❤

Answer 2

Explanation:

At heights of above 80 km (50 mi), in the thermosphere, the atmosphere is so thin that free electrons can exist for short periods of time before they are captured by a nearby positive ion. This portion of the atmosphere is partially ionized and contains a plasma which is referred to as the ionosphere.