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The mesosphere layer of Earth's atmosphere typically extends from about 31 miles (50 kilometers) to 53 miles (85 kilometers) above the Earth's surface.
The thermosphere is the layer of the atmosphere that lies between the mesosphere and the exosphere. It is characterized by increasing temperatures with altitude and is where the auroras occur.
The air temperature in the mesosphere layer decreases with increasing altitude. This is because the mesosphere is the coldest layer of the Earth's atmosphere, with temperatures decreasing to as low as -90 degrees Celsius at the top of the layer. The decrease in temperature is primarily caused by the decreasing density of gas molecules at higher altitudes in the mesosphere.
The mesosphere is the least studied layer of the atmosphere. It is located between the stratosphere and the thermosphere and is challenging to study due to its high altitude and limited accessibility for scientific instruments.
The mesosphere is the layer of Earth's atmosphere between the stratosphere and thermosphere, where temperatures decrease with altitude.
Auroras occur in the thermosphere, which is the second-highest layer of Earth's atmosphere. The thermosphere is located between the mesosphere and the exosphere, at an altitude ranging from about 80 km to 600 km above the Earth's surface.