Opaque Plasma
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Opaque Plasma
</dt>
A plasma
through which an electromagnetic
wave cannot propagate and is either absorbed or reflected.
</dd>
In general, a plasma is opaque for frequencies below the plasma
frequency. The fact that a plasma is opaque over a certain frequency range
will change the radiation properties within that frequency range. Any
radiation emitted within the volume of the plasma is quickly absorbed. In this
opaque region, therefore, the plasma can only radiate from its surface.
</dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use