Leptocline as a shallow substructure of near-surface shear layer in 3D radiative hydrodynamic simulations

Irina N. Kitiashvili, A. G. Kosovichev, A. A. Wray, V. M. Sadykov, G. Guerrero

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Understanding the effects driven by rotation in the solar convection zone is essential for many problems related to solar activity, such as the formation of differential rotation, meridional circulation, and others. We analyse realistic 3D radiative hydrodynamics simulations of solar subsurface dynamics in the presence of rotation in a local domain 80 Mm wide and 25 Mm deep, located at 30° latitude. The simulation results reveal the development of a shallow 10 Mm deep substructure of the near-surface shear layer (NSSL), characterized by a strong radial rotational gradient and self-organized meridional flows. This shallow layer ('leptocline') is located in the hydrogen ionization zone associated with enhanced anisotropic overshooting-type flows into a less unstable layer between the H and He ii ionization zones. We discuss current observational evidence of the presence of the leptocline and show that the radial variations of the differential rotation and meridional flow profiles obtained from the simulations in this layer qualitatively agree with helioseismic observations.

Original languageEnglish (US)
Pages (from-to)504-512
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume518
Issue number1
DOIs
StatePublished - Jan 1 2023

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: interior
  • Sun: rotation
  • convection
  • hydrodynamics
  • methods: numerical

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