Temperature vs. height in the photosphere.
including the relative strengths of various lines and the details of certain line profiles.
From observations of various spectral lines, the temperature profile for the photosphere has been derived. It is shown in Fig. 6.14. Note that the temperature falls as one goes up from the base of the photosphere. This is what we might expect, since we are moving farther from the heating source. However, an interesting phenomenon is observed. The temperature reaches a minimum at 500 km above the base of the photosphere, and then begins to rise with altitude. We will see below that this temperature rise continues into the higher layers.
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