Difference between revisions of "Optically Effective Atmosphere"
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Optically Effective Atmosphere
</dt>
That portion of the atmosphere
lying below the altitude from which scattered light at twilight still reaches
the observer with sufficient intensity to be discerned. Also called
effective atmosphere.
</dd>
The top of this region lies between 50 and 60 kilometers.
</dd>
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
