Abstract
On spectrograms of the K line at quiet regions of the Sun, bright threads visible in the real continuum due to the granulations are also seen in the outer wing as far as ¦Δλ¦ ∼ 3 Å from the line centre. At the inner wing (3 Å ≳ ¦Δλ¦ ≳ 0.5 Å) bright threads are also seen, but their spatial distribution is different from the former ones. The threads at the inner wing appear at intergranular regions, and many of them are seen inside the supergranulation. Their size and number density are about the same as those of the granulation. These facts reflect that the penetration of the granular high temperature layer stops at a certain height in the photosphere, and that the intergranular bright threads at the inner wing are due to a hotter temperature layer, located at a considerably higher photospheric layer than the granulation.
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Suemoto, Z., Hiei, E. & Nakagomi, Y. Bright threads in the inner wing of solar Ca II K line. Sol Phys 112, 59–66 (1987). https://doi.org/10.1007/BF00148487
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DOI: https://doi.org/10.1007/BF00148487