How Do You See Spectral Lines in Near IR from the Sun?

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When observing the sun with a near IR/IR spectrometer, one can detect absorption lines from elements like H2 and He due to cooler matter near the sun's surface. These spectral lines appear as dark features against the bright continuous background spectrum emitted by the sun. The heat from the sun does not drown out these lines because they originate from specific wavelengths absorbed by the cooler gases. The contrast between the cooler gases and the hot background allows for the identification of these spectral features. Thus, it is possible to see and analyze spectral lines in the near IR from the sun.
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Hi,
Quick spectroscopy question: Say I am looking at the sun with a near IR /IR spectrometer? I know there is H2 and He in the sun, and I assume I will see their spectral lines? If true, how come I see that, and the signal is not drowned by the heat from the sun? (since it is so hot, using stefan-boltzman law, i can determine energy, etc etc)
Thanks
rp895
 
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The lines you will see are absorption lines (dark) from the cooler matter near the surface. The background spectrum is continuous and bright.
 

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