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However, the aurora borealis and aurora australis sometimes occur in the lower part of the exosphere, where they overlap into the thermosphere.The exosphere contains most of the satellites orbiting Earth.These free-moving particles follow ballistic trajectories and may migrate in and out of the magnetosphere or the solar wind.The exosphere is located too far above Earth for any meteorological phenomena to be possible.Many substances of natural origin may be present in locally and seasonally variable small amounts as aerosols in an unfiltered air sample, including dust of mineral and organic composition, pollen and spores, sea spray, and volcanic ash.
Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
The height of the thermopause varies considerably due to changes in solar activity.
Because the thermopause lies at the lower boundary of the exosphere, it is also referred to as the exobase.
Besides argon, already mentioned, other noble gases, neon, helium, krypton, and xenon are also present.
Filtered air includes trace amounts of many other chemical compounds.
The three major constituents of Earth's atmosphere are nitrogen, oxygen, and argon.