Layers of the atmosphere

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Stratosphere

  • The top is around 50km in altitude and the bottom is variable (depending upon seasons)
  • The top is 16km around the equator and 5km around the poles 
  • The air is around 1,000x thinner at the top of the stratosphere and very dry (no water vapour)
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Mesosphere

  • Temps start to decrease ad extends to around 85km in height
  • Hard to measure due to jets and weather ballons being unable to reach such heights
  • Orbits go higher
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Thermosphere

  • 90km where temperatures increase sharply
  • Typically 200 degrees hotter in the day than at night
  • Roughly 500 degrees hotter when the sun is more active 
  • The upper atmosphere can go 2,000 degrees (due to the sun)
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