What has provided the best data about the interior of the Sun?

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Helioseismology is the study of the Sun's internal structure and dynamics through the analysis of its surface oscillations. This has provided the most detailed information about the Sun's interior, allowing scientists to understand its composition, temperature gradient, and density distribution. Sunspots, evolving luminosity, and solar X-rays, while providing valuable information about the Sun, do not give as much insight into its interior.

What Has Provided the Best Data About the Interior of the Sun