Publications

Käpylä, M. J.; Rheinhardt, M.; Brandenburg, A.: Compressible Test-field Method and Its Application to Shear Dynamos. The Astrophysical Journal 932, p. 8 (2022)

Lehtinen, J. J.; Käpylä, M. J.; Hackman, T.; Kochukhov, O.; Willamo, T.; Marsden, S.C.; Jeffers, S. V.; Henry, G.W.; Jetsu, L.: Topological changes in the magnetic field of LQ Hya during an activity minimum. Astronomy and Astrophysics 660, A141 (2022)

Willamo, T.; Lehtinen, J. J.; Hackman, T.; Käpylä, M. J.; Kochukhov, O.; Jeffers, S. V.; Korhonen, H.; Marsden, S. C.: Zeeman-Doppler imaging of five young solar-type stars. Astronomy and Astrophysics 659, p. A71 (2022)

The Pencil Code Collaboration; Brandenburg, A.; Johansen, A.; Bourdin, P. A.; Dobler, W.; Lyra, W.; Rheinhardt, M.; Bingert, S.; Haugen, N. E. L.; Mee, A. et al.; Gent, F.; Babkovskaia, N.; Yang, C.-C.; Heinemann, T.; Dintrans, B.; Mitra, D.; Candelaresi, S.; Warnecke, J.; Käpylä, P. J.; Schreiber, A.; Chatterjee, P.; Käpylä, M. J.; Li, X.-Y.; Krüger, J.; Aarnes, J. R.; Sarson, G. R.; Oishi, J. S.; Schober, J.; Plasson, R.; Sandin, C.; Karchniwy, E.; Rodrigues, L. F. S.; Hubbard, A.; Guerrero, G.; Snodin, A.; Losada, I. R.; Pekkilä, J.; Qian, C.: The Pencil Code, a modular MPI code for partial differential equations and particles: multipurpose and multiuser-maintained. The Journal of Open Source Software 6 (58), 2807 (2021)

Barekat, A.; Käpylä, M. J.; Käpylä, P.J.; Gilson, E.P.; Ji, H.: Generation of mean flows in rotating anisotropic turbulence: The case of solar near-surface shear layer. Astronomy and Astrophysics 655, A79 (2021)

Gent, F. A.; Mac Low, M.-M.; Käpylä, M. J.; Singh, N. K.: Small-scale Dynamo in Supernova-driven Interstellar Turbulence. The Astrophysical Journal Letters 910 (2), L15 (2021)

Jingade, N.; Singh, N. K.: Mean field dynamo action in shearing flows - II. Fluctuating kinetic helicity with zero mean. Monthly Notices of the Royal Astronomical Society 508 (4), pp. 5163 - 5175 (2021)

Prabhu, A. P.; Singh, N. K.; Käpylä, M. J.; Lagg, A.: Inferring magnetic helicity spectrum in spherical domains: Method and example applications. Astronomy and Astrophysics 654, A3 (2021)

Viviani, M.; Käpylä, M. J.: Physically motivated heat conduction treatment in simulations of solar-like stars: effects on dynamo transitions. Astronomy and Astrophysics 645, A141 (2021)

Warnecke, J.; Rheinhardt, M.; Viviani, M.; Gent, F. A.; Tuomisto, S.; Käpylä, M. J.: Investigating Global Convective Dynamos with Mean-field Models: Full Spectrum of Turbulent Effects Required. The Astrophysical Journal Letters 919 (2), L13 (2021)

Alvarez Vizoso, J.; Kirby, M.; Peterson, C.: Manifold curvature learning from hypersurface integral invariants. Linear Algebra and its Applications 602, pp. 179 - 205 (2020)

Gent, F.A.; Mac Low, M.M.; Käpylä, M. J.; Sarson, G.R.; Hollins, J.F.: Modelling supernova-driven turbulence. Geophysical and Astrophysical Fluid Dynamics 114 (1-2), pp. 77 - 105 (2020)

Jingade, N.; Singh, N. K.: Mean field dynamo action in shear flows. I: fixed kinetic helicity. Monthly Notices of the Royal Astronomical Society 495 (4), pp. 4557 - 4569 (2020)

Käpylä, M. J.; Alvarez Vizoso, J.; Rheinhardt, M.; Brandenburg, A.; Käpylä, P.; Singh, N. K.: On the Existence of Shear-current Effects in Magnetized Burgulence. The Astrophysical Journal 905 (2), 179 (2020)

Käpylä, P. J.; Gent, F. A.; Olspert, N.; Käpylä, M. J.; Brandenburg, A.: Sensitivity to luminosity, centrifugal force, and boundary conditions in spherical shell convection. Geophysical and Astrophysical Fluid Dynamics 14 (1-2), pp. 8 - 34 (2020)

Käpylä, P. J.; Rheinhardt, M.; Brandenburg, A.; Käpylä, M. J.: Turbulent viscosity and magnetic Prandtl number from simulations of isotropically forced turbulence. Astronomy and Astrophysics 636, A93 (2020)

Lehtinen, J.; Käpylä, M. J.; Olspert,, N.; Spada, F.: A Knee-Point in the Rotation-Activity Scaling of Late-type Stars with a Connection to Dynamo Transitions. (submitted)

Lehtinen, J.; Spada, F.; Käpylä, M. J.; Olspert, N.; Käpylä, P. J.: Common dynamo scaling in slowly rotating young and evolved stars. Nature astronomy 4, pp. 658 - 662 (2020)

Prabhu, A.; Brandenburg, A.; Käpylä, M. J.; Lagg, A.: Helicity proxies from linear polarisation of solar active regions. Astronomy and Astrophysics 641, A46 (2020)

Singh, N. K.; Raichur, H.; Käpylä, M. J.; Rheinhardt, M.; Brandenburg, A.; Käpylä, P. J.: f-mode strengthening from a localised bipolar subsurface magnetic field. Geophysical and Astrophysical Fluid Dynamics 114 (1-2), pp. 196 - 212 (2020)