Aspects of this topic are discussed in the following places at Britannica.
About 1930 German astronomer Walter Grotrian examined spectra of the solar corona he had obtained at a total eclipse. He noticed that, although coronal light had the same distribution of colours as light from the solar surface—the photosphere—it lacked the absorption lines observed in photospheric light. Grotrian hypothesized that coronal light consists of photospheric light that...
in Sun: History of observation )
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