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Microturbulence is a form of turbulence that varies over small distance scales. (Large-scale turbulence is called macroturbulence.)
Additional recommended knowledge
In the chromosphere of a star, microturbulence can be caused by turbulence in the outer atmosphere. It is one of several mechanisms that can cause broadening of the absorption lines in the stellar spectrum. Stellar microturbulence varies with the effective temperature and the surface gravity.
The plasma in a star undergoes convection as a mechanism for energy transport. When examined by a spectroscope, the velocity of the convective gas along the line of sight produces Doppler shifts in the absorption bands. It is the distribution of these velocities along the line of sight that produces the microturbulence broadening of the absorption lines. The strength of the microturbulence (symbolized by ξ, in units of km s-1) can be determined by comparing the broadening of strong lines versus weak lines.
Magnetic nuclear fusion
Microturbulence also plays a critical role in energy transport during magnetic nuclear fusion experiments, such as the Tokamak.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Microturbulence". A list of authors is available in Wikipedia.|