Origin of the Near-Surface Rotational Shear Layer of the Sun

Cover Page

Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

Helioseismology has revealed an increase in the rotation rate with depth in a thin (∼30 Mm)
near-surface layer. The normalized rotational shear in this layer does not depend on latitude. This rotational
state is shown to be a consequence of the short characteristic time of near-surface convection compared
to the rotation period and radial anisotropy of convective turbulence. Analytical calculations within meanfield
hydrodynamics reproduce the observed normalized rotational shear and are consistent with numerical
experiments on radiative hydrodynamics of solar convection. The near-surface shear layer is the source of
global meridional flow important for the solar dynamo.

About the authors

L. L. Kitchatinov

Institute of Solar–Terrestrial Physics, Russian Academy of Sciences,
Siberian Branch; Pulkovo Astronomical Observatory, Russian Academy of Sciences

Author for correspondence.
Email: kit@iszf.irk.ru
Irkutsk, 664033 Russia; St. Petersburg, 196140 Russia

References

  1. Абраменко и др. (V.I. Abramenko, G.P. Zank, A. Dosch, V.B. Yurchyshyn, P.R. Goode, K. Ahn, and W. Cao), Astrophys. J. 773, 167 (2013).
  2. Антиа, Базу (H.M. Antia and S. Basu), Astrophys. J. 924, 19 (2022).
  3. Барикет и др. (A. Barekat, J. Schou, and L. Gizon), Astron. Astrophys. 570, L12 (2014).
  4. Бранденбург (A. Brandenburg), Astrophys. J. 625, 539 (2005).
  5. Бранденбург и Субраманиан (A. Brandenburg and K. Subramanian), Astron. Astrophys. 439, 835 (2005).
  6. Гетлинг и др. (A.V. Getling, O.S. Mazhorova, and O.V. Shcheritsa), Geomagnetism and Aeronomy 53, 904 (2013).
  7. Гундерсон, Баттачержи (L.M. Gunderson and A. Bhattacharjee), Astrophys. J. 870, 47 (2019).
  8. Джа, Чудури (B.K. Jha and A.R. Choudhuri), MNRAS 506, 2189 (2021).
  9. Китиашвили и др. (I.N. Kitiashvili, A.G. Kosovichev, A.A. Wray, V.M. Sadykov, and G. Guerrero), MNRAS 518, 504 (2023).
  10. Кичатинов Л.Л., Успехи физ. наук 175, 475 (2005) [L.L. Kitchatinov, Physics-Uspekhi 48, 449 (2005)].
  11. Кичатинов (L.L. Kitchatinov), Solar and Astrophysical Dynamos and Magnetic Activity, IAU Symp. 294 (Ed. A.G. Kosovichev, E. de Gouveia Dal Pino, Y. Yan, Cambridge Univ. Press, 2013), p. 399.
  12. Кичатинов Л.Л. Письма в Астрон. журн. 42, 379 (2016а) [L.L. Kitchatinov, Astron. Lett. 42 339 (2016a)].
  13. Кичатинов (L.L. Kitchatinov), Geomagnetism and Aeronomy 56, 945 (2016b).
  14. Кичатинов, Олемской (L.L. Kitchatinov and S.V. Olemskoy), MNRAS 411, 1059 (2011).
  15. Комм (R. Komm), Frontier. Astron. Space Sci. 9, 428 (2022).
  16. Лайда и др. (Y. Lida, T. Yokoyama, and K. Ichimoto), Astrophys. J. 713, 325 (2010).
  17. Лебединский А.И., Астрон. журн. 18, 10 (1941).
  18. Пакстон и др. (B. Paxton, M. Cantiello, P. Arras, L. Bildsten, E.F. Brown, A. Dotter, C. Mankovich, M.H. Montgomery et al.), Astrophys. J. Suppl. Ser. 208, 4 (2013).
  19. Пипин, Косовичев (V.V. Pipin and A.G. Kosovichev), Astrophys. J. 727, L45 (2011).
  20. Рюдигер (G. Rüdiger), Differential rotation and stellar convection: Sun and solar-type stars (Berlin: Akademie-Verlag, 1989).
  21. Рюдигер и др. (G. Rüdiger, L.L. Kitchatinov, and R. Hollerbach), Magnetic processes in astrophysics (Weinheim: WILEY-VCH, 2013).
  22. Томсон и др. (M.J. Thompson, J. Toomre, E.R. Anderson, H.M. Antia, G. Berthomieu, D. Burtonclay, S.M. Chitre, J. Christensen-Dalsgaard, et al.), Science 272, 1300 (1996).
  23. Штикс и др. (M. Stix, G. Rüdiger, M. Knölker, and U. Grabowski), Astron. Astrophys. 272, 340 (1993).
  24. Шу и др. (J. Schou, H.M. Antia, S. Basu, R.S. Bogart, R.I. Bush, S.M. Chitre, J. Christensen-Dalsgaard, M.P. Di Mauro, et al.), Astrophys. J. 505, 390 (1998).
  25. Щерица и др. (O.V. Shcheritsa, A.V. Getling, and O.S. Mazhorova), Phys. Lett. A 382, 639 (2018).
  26. Хазра и др. (G. Hazra, D. Nandy, L.L. Kitchatinov, and A.R. Choudhuri), Space Sci. Rev. 219, 39 (2023).
  27. Хотта и др. (H. Hotta, M. Rempel, and T. Yokoyama), Astrophys. J. 798, 42 (2015).
  28. Эллис и др. (L. Yelles Chaouche, R.H. Cameron, S.K. Solanki, T.L. Riethmüller, L.S. Anusha, V. Witzke, A.I. Shapiro, P. Barthol, et al.), Astron. Astrophys. 644, 44 (2020).

Supplementary files

Supplementary Files
Action
1. JATS XML
Download

Copyright (c) 2023 Pleiades Publishing, Ltd.