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It has practical importance because it influences, for example, radio propagation on Earth.

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The ionosphere forms the inner edge of the magnetosphere. The mesosphere is mainly accessed by sounding rockets and rocket-powered aircraft.

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In this way, Earth's atmosphere can be divided called atmospheric stratification into five main layers. However, the aurora borealis and aurora australis sometimes occur in the lower part of the exosphere, where they overlap into the thermosphere.

It has basically all the weather-associated cloud genus types generated by active wind circulation, although very tall cumulonimbus thunder clouds can penetrate the tropopause from below and rise into the lower part of the stratosphere.

More sophisticated models are used to predict orbital decay of satellites. Meteors begin to glow in this region, though the larger ones may not burn up until they penetrate more deeply.

The air is so rarefied that an individual molecule of oxygenfor example travels an average of 1 kilometre 0.

The refractive index of air depends on temperature, [33] giving rise to refraction effects when the temperature gradient is large. For example, O2 and O3 absorb almost all wavelengths shorter than nanometers. Aurorae shown here at the bottom of the thermosphere can actually form at any altitude in this atmospheric layer.

However, volcanic eruptions also release carbon dioxide, which plants can convert to oxygen. Principal layers In general, air pressure and density decrease with altitude in the atmosphere.

Thus, the exosphere no longer behaves like a gas, and the particles constantly escape into space. It actually decreases exponentially with altitude, dropping by half every 5. Objects tend to emit amounts and wavelengths of radiation depending on their " black body " emission curves, therefore hotter objects tend to emit more radiation, with shorter wavelengths.

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The mesosphere is also the layer where most meteors burn up upon atmospheric entrance. Stratosphere The stratosphere is the second-lowest layer of Earth's atmosphere. This layer is mainly composed of extremely low densities of hydrogen, helium and several heavier molecules including nitrogen, oxygen and carbon dioxide closer to the exobase.

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Because of its temperature, the atmosphere emits infrared radiation. They are most readily visible when the Sun is around 4 to 16 degrees below the horizon. Unsourced material may be challenged and removed.

Colder objects emit less radiation, with longer wavelengths. Most conventional aviation activity takes place in the troposphere, and it is the only layer that can be accessed by propeller-driven aircraft.

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It contains the ozone layer, which is the part of Earth's atmosphere that contains relatively high concentrations of that gas. This is also why it becomes colder at night at higher elevations. Limb view, of Earth's atmosphere.

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Molecules of free oxygen did not start to accumulate in the atmosphere until the rate of production of oxygen began to exceed the availability of reducing materials that removed oxygen. Here, the chemical composition varies with altitude.

The ozone layer is contained within the stratosphere. The geomagnetic storms cause beautiful displays of aurora across the atmosphere.