What is the upper height of atmosphere?
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The upper atmosphere typically begins around 70 km above sea level. It stops when the magnetic field governs alone (see The magnetosphere: under the influence of the Earth and the Sun). It therefore covers part of the homosphere and the entire heterosphere.
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The thermosphere (or the upper atmosphere) is the height region above 85 kilometres (53 mi), while the region between the tropopause and the mesopause is the middle atmosphere (stratosphere and mesosphere) where absorption of solar UV radiation generates the temperature maximum near an altitude of 45 kilometres
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