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February 5, 2026

Rotational radial shear in the low solar photosphere

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Authors

TCT. CorbardMFM. FaurobertBGB. Gelly

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Overview

Spectroscopic analysis reveals rotational velocity changes in the low solar photosphere, suggesting important dynamics.

Key Points

  • The aim is to measure differential rotational velocity at various heights within the low solar photosphere.
  • Conducted spectroscopic scans of granular regions using Fe I 630.15 nm and Ca I 616.2 nm lines.
  • Measured image displacements at different line chords between consecutive scans.
  • Ensured excellent seeing with stable adaptive optics and scanning times short enough for granulation stability.
  • Utilized THEMIS and HINODE Solar Optical Telescope data for measuring height differences.
  • Observed a parabolic decrease in rotational velocity with height, reaching approximately 16% slower at 80 km above the continuum.
  • No significant velocity differences were noted between the equator and ±25° latitudes.

Cite This Study

Corbard et al. (2025) studied this question.

synapsesocial.com/papers/69843412f1d9ada3c1fb1cabhttps://doi.org/10.1051/0004-6361/202556102/pdf
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