NASA NTRS · 19900033050
How deep can one see into the sun?
Abstract
Conventional wisdom dictates that the 1.642-micron H(-) opacity minimum is the best window to the depths of the solar photosphere. However, the violet continuum near 0.4 micron exhibits a larger intensity response to small thermal perturbations at depth, and thus might offer an even better view of the subsurface roots of granulation cells and magnetic flux tubes.
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Ayres, Thomas R.. 1989-01-01. How deep can one see into the sun?. https://ntrs.nasa.gov/citations/19900033050
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