Publications in refereed journals (also on ADS)

45. Snellman, J.E., Rheinhardt, M., Käpylä, P. J., Mantere, M. J. & Brandenburg, A. 2012, "Mean-field closure parameters for passive scalar turbulence", Physica Scripta (submitted) (pdf, arXiv)

44. Warnecke, J., Käpylä, P. J., Mantere, M. J. & Brandenburg, A. 2012, "Coronal ejections driven by a convective dynamo with differential rotation in a sphere", Solar Phys. (submitted) (pdf, arXiv)

43. Käpylä, P. J., Mantere, M. J. & Brandenburg, A. 2012, "Oscillatory large-scale dynamos from Cartesian convection simulations", GAFD (submitted) (pdf, arXiv)

42. Käpylä, P. J., Brandenburg, A., Kleeorin, N., Mantere, M. J. & Rogachevskii, I. 2012, "Negative effect of turbulent convection on mean magnetic pressure", MNRAS (submitted) (pdf, arXiv)

41. Snellman, J.E., Brandenburg, A., Käpylä, P. J. & Mantere, M.J. 2012, "Verification of Reynolds stress parameterizations from simulations", AN, 333, 78 (pdf, arXiv)

40. Käpylä, P. J., Mantere, M.J. & Brandenburg, A. 2011, "Effects of stratification in spherical shell convection", AN, 332, 883 (pdf, arXiv)

39. Mantere, M.J., Käpylä, P. J. & Hackman, T. 2011, "Dependence of the large-scale vortex instability on latitude, stratification and domain size", AN, 332, 876 (pdf, arXiv)

38. Rogachevskii, I., Kleeorin, N., Käpylä, P. J. & Brandenburg, A. 2011, "Pumping velocity in homogeneous helical turbulence with shear", Phys. Rev. E, 84, 056314 (pdf, arXiv)

37. Käpylä, P. J., Mantere, M. J. & Hackman, T. 2011, "Starspots due to large-scale vortices in rotating turbulent convection", ApJ, 742, 34 (pdf, arXiv, ADS)

36. Guerrero, G. & Käpylä, P. J., 2011, "Dynamo action and magnetic buoyancy in convection simulations with vertical shear", A&A, 533, A40 (pdf, arXiv, ADS)

35. Käpylä, P. J., Mantere, M. J., Guerrero, G., Brandenburg, A. & Chatterjee, P. 2011, "Reynolds stress and heat flux in spherical shell convection", A&A, 531, A162 (pdf, arXiv, ADS)

34. Käpylä, P. J. & Korpi, M. J. 2011, "Magnetorotational instability driven dynamos at low magnetic Prandtl numbers", MNRAS, 413, 901 (pdf, arXiv, ADS)

33. Käpylä, P. J. 2011, "On global solar dynamo simulations", AN, 332, 43 (pdf, arXiv, ADS)

32. Brandenburg, A., Chatterjee, P., Del Sordo, F., Hubbard, A., Käpylä, P. J. & Rheinhardt, M. 2010, "Turbulent transport in hydromagnetic flows", Physica Scripta, T142, 014028 (pdf, arXiv, ADS)

31. Käpylä, P. J., Korpi, M. J. & Brandenburg, A. 2010, "Open and closed boundaries in large-scale convective dynamos", A&A, 518, A22 (pdf, arXiv, ADS)

30. Mitra, D., Tavakol, R., Käpylä, P. J., & Brandenburg, A. 2010, "Oscillatory migrating magnetic fields in helical turbulence in spherical domains", ApJ, 719, L1 (pdf, arXiv, ADS)

29. Käpylä, P. J., Brandenburg, A., Korpi, M. J., Snellman, J. E. & Narayan, R. 2010, "Angular momentum transport in convectively unstable shear flows", ApJ, 719, 67 (pdf, arXiv, ADS)

28. Käpylä, P. J., Korpi, M. J. & Brandenburg, A. 2010, "The α effect in rotating convection with sinusoidal shear", MNRAS, 402, 1458 (pdf, arXiv, ADS)

27. Käpylä, P. J., Korpi, M. J., Brandenburg, A., Mitra, D. & Tavakol, R. 2010, "Convective dynamos in spherical wedge geometry", AN, 331, 73 (pdf, arXiv, ADS)

26. Korpi, M. J., Käpylä, P. J. & Väisälä, M. S. 2010, "Influence of Ohmic diffusion on the excitation and dynamics of MRI", AN, 331, 34 (pdf, arXiv, ADS)

25. Snellman, J. E., Käpylä, P. J., Korpi, M. J. & Liljeström, A. J. 2009, "Reynolds stresses from hydrodynamic turbulence with shear and rotation", A&A, 505, 955 (pdf, arXiv, ADS)

24. Hubbard, A., Del Sordo, F., Käpylä, P. J., & Brandenburg, A. 2009, "The alpha effect with imposed and dynamo-generated magnetic fields", MNRAS, 398, 1891 (pdf, arXiv, ADS)

23. Käpylä, P. J., Korpi, M. J. & Brandenburg, A. 2009, "Alpha effect and turbulent diffusion from convection", A&A, 500, 633 (pdf, arXiv, ADS)

22. Käpylä, P. J. & Brandenburg, A. 2009, "Turbulent dynamos with shear and fractional helicity", ApJ, 699, 1059 (pdf, arXiv, ADS)

20. Mitra, D., Käpylä, P. J., Tavakol, R. & Brandenburg, A. 2009 "Alpha effect and diffusivity in helical turbulence with shear", A&A, 495, 1 (pdf, arXiv, ADS)

19. Käpylä, P. J., Mitra, D. & Brandenburg, A. 2009 "Numerical study of large-scale vorticity generation in shear-flow turbulence", Phys. Rev. E, 79, 016302 (pdf, arXiv, ADS)

18. Liljeström, A. J., Korpi, M. J., Käpylä, P. J., Brandenburg, A. & Lyra, W. 2009 "Turbulent stresses as a function of shear rate in a local disk model", AN, 330, 92 (pdf, arXiv, ADS)

17. Käpylä, P. J., Korpi, M. J. & Brandenburg, A. 2008, "Large-scale dynamos in turbulent convection with shear", A&A, 491, 353 (pdf, arXiv, ADS)

16. Käpylä, P. J. & Brandenburg, A. 2008, "Lambda-effect from forced turbulence simulations", A&A, 488, 9 (pdf, arXiv, ADS)

15. Jouve, L., Brun, A. S., Arlt, R., Brandenburg, A., Dikpati, M., Bonanno, A., Käpylä, P. J., Moss, D., Rempel, M., Gilman, P., Korpi, M. J. & Kosovichev, A. G. 2008, "A solar mean field dynamo benchmark", A&A, 483, 949 (pdf, ADS)

14. Brandenburg, A., Rädler, K.-H., Rheinhardt, M. & Käpylä, P. J. 2008, "Magnetic diffusivity tensor and dynamo effects in rotating and shearing turbulence," ApJ, 676, 740 (pdf, arXiv, ADS)

13. Brandenburg, A., Käpylä, P. J., Mitra, D., Moss, D. & Tavakol, R. 2007, "The helicity constraint in spherical shell dynamos", AN, 328, 1118 (pdf, arXiv, ADS)

12. Käpylä, P. J. & Brandenburg, A. 2007, "Turbulent viscosity and Λ-effect from numerical turbulence models", AN, 328, 1006 (pdf, arXiv, ADS)

11. Brandenburg, A. & Käpylä, P. J. 2007, "Magnetic helicity effects in astrophysical and laboratory dynamos", New Journal of Physics, 9, 305 (pdf, arXiv, ADS)

10. Hupfer, C., Käpylä, P. J., & Stix, M. 2006, "Reynolds stresses and meridional circulation from rotating cylinder simulations", A&A, 459, 935 (pdf, ADS)

9. Käpylä, P. J., Korpi, M. J. & Tuominen, I. 2006, "Solar dynamo models with α-effect and turbulent pumping from local 3D convection calculations", AN, 327, 884 (pdf, arXiv, ADS)

8. Käpylä, P. J., Korpi, M. J., Ossendrijver, M. & Stix, M. 2006, "Magnetoconvection and dynamo coefficients III: α-effect and magnetic pumping in the rapid rotation regime", A&A, 455, 401 (pdf, arXiv, ADS)

7. Käpylä, P. J., Korpi, M. J., Ossendrijver, M. & Tuominen, I. 2006, "Local models of stellar convection III: The Strouhal number", A&A, 448, 433 (pdf, arXiv, ADS)

6. Käpylä, P. J., Korpi, M. J., Stix, M. & Tuominen, I. 2005, "Local models of stellar convection II: Rotation dependence of the mixing-length relations", A&A, 438, 403. (pdf, arXiv, ADS)

4. Käpylä, P. J., Korpi, M. J., Ossendrijver, M. & Tuominen, I. 2005, "Estimates of the Strouhal number from numerical models of convection", AN, 326, 186 (pdf, arXiv, ADS)

3. Brandenburg, A., Haugen, N. E. L., Käpylä, P. J. & Sandin, C. 2005, "The problem of small and large scale fields in the solar dynamo", AN, 326, 174 (pdf, arXiv, ADS)

2. Käpylä, P. J., Korpi, M. J. & Tuominen, I. 2004, "Local models of stellar convection: Reynolds stresses and turbulent heat transport", A&A, 422, 793. (pdf, arXiv, ADS)

1. Brandenburg, A., Käpylä, P. J. & Mohammed, A. 2004, "Non-Fickian diffusion and tau-approximation from numerical turbulence", Physics of Fluids, 16, 1020 (pdf, arXiv, ADS)

11. Warnecke, J., Käpylä, P. J., Mantere, M. J., & Brandenburg, A.: 2011, "Coronal ejections from convective spherical shell dynamos," in Comparative Magnetic Minima: Characterizing quiet times in the Sun and stars, eds. C. H. Mandrini, Proc. IAUS 286, (in press) (arXiv)

10. Cantiello, M., Braithwaite, J., Brandenburg, A., Del Sordo, F., Käpylä, P. J., & Langer, N.: 2011, "Turbulence and magnetic spots at the surface of hot massive stars,'' in Physics of Sun and Star Spots, eds. D.P. Choudhary & K.G. Strassmeier, Proc. IAUS 273 (in press) (arXiv)

9. Cantiello, M., Braithwaite, J., Brandenburg, A., Del Sordo, F., Käpylä, P. J. & Langer, N. 2011, "3D MHD simulations of subsurface convection in OB stars", in Active OB stars: structure, evolution, mass loss, and critical limits, eds. C. Neiner, G. Wade, G. Meynet, & G. Peters, Proc. IAUS 272, 32 (arXiv, ADS)

8. Brandenburg, A., Käpylä, P. J. & Korpi, M. J., 2011, "From convective to stellar dynamos," in Astrophysical Dynamics: From Stars to Galaxies", eds. N. Brummell, A.S. Brun, M.S. Miesch, & Y. Ponty, Proc. IAUS 271, 279 (arXiv, ADS)

7. Mitra, D., Tavakol, R., Brandenburg, A. & Käpylä, P. J. 2010, "Oscillatory migratory large-scale fields in mean-field and direct simulations", in Solar and Stellar Variability: Impact of Earth and Planets, eds. A.G. Kosovichev, A.H. Andrei & J.-P. Rozelot, Proc. IAUS 264, 197 (ADS)

6. Tuominen, I., Korpi, M. J., Käpylä, P. J., Lindborg, M. & Ilyin, I. 2009, "Stellar nonlinear dynamos: observations and modelling", in Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, eds. K.G. Strassmeier, A.G. Kosovichev, J.E. Beckman, Proc. IAUS 259, 417 (pdf, ADS)

5. Käpylä, P. J., Korpi, M. J., Stix, M. & Tuominen, I. 2006, "Effects of Rotation and Input Energy Flux on Convective Overshooting", in Convection in Astrophysics, eds. F. Kupka, I.W. Roxburgh, K.L. Chan, Proc. IAUS 239, 35 (arXiv, ADS)

4. Ossendrijver, M. & Käpylä, P. J. 2006, "Transport coefficients for solar and stellar dynamos", in Solar activity and its magnetic origin, eds. A.A. Hady, V. Bothmer, Proc. IAUS 233, 3 (pdf, ADS)

3. Brandenburg, A. & Käpylä, P. J. 2006, "Connection between active longitudes and magnetic helicity", in Solar activity: exploration, understanding and prediction, ed. H. Lundstedt, ESA, ESTEC Noordwijk, The Netherlands (in press) (arXiv, ADS)

2. Brandenburg, A., Käpylä, P. J. & Mohammed, A. 2005, "Passive scalar diffusion as a damped wave", in Progress in Turbulence, ed. J. Peinke, A. Kittel, S. Barth, & M. Oberlack, Springer-Verlag, 3 (arXiv, ADS)

1. Brandenburg, A., Sandin, C. & Käpylä, P. J. 2004, "Helical coronal ejections and their role in the solar cycle", in Multi-Wavelength Investigations of Solar Activity, eds. A. V. Stepanov, E. E. Benevolenskaya & A. G. Kosovichev, Proc. IAUS 223, 57 (arXiv, ADS)

PhD dissertation: Local numerical modelling of magnetoconvection and turbulence - implications for mean-field theories (University of Helsinki, 2006) link