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The Fraunhofer lines are a set of spectral absorption lines. They are dark absorption lines, seen in the optical spectrum of the Sun, and are formed when atoms in the solar atmosphere absorb light being emitted by the solar photosphere. The lines are named after the German physicist Joseph von Fraunhofer, who observed them in 1814. This image shows the solar spectral irradiance measured with a calibrated optical spectrometer, as viewed on a sunny day in Switzerland in 2022. Some of the characteristic Fraunhofer lines and their corresponding elements are indicated for the extended visible spectrum – the highlighted area of the graph.
Graph credit: Cyamahat
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