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temperature minimum

A Dictionary of Astronomy | 1997 | 404 words | Copyright

temperature minimum A region in the Sun's atmosphere that marks the boundary between the photosphere and the chromosphere. It lies about 550 km above the base of the photosphere, where the temperature reaches a minimum of about 4400 K. Above the temperature minimum, the temperature rises steadily to about 6000 K at a height of about 1000 km, and then more rapidly higher up.

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