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Research Output

2020

Common dynamo scaling in slowly rotating young and evolved stars

Lehtinen, J. J., Spada, F., Käpylä, M. J., Olspert, N. & Käpylä, P. J., 1 Jan 2020, In : Nature Astronomy.

Research output: Contribution to journalLetterScientificpeer-review

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13 Downloads (Pure)

Electrodynamics of turbulent fluids with fluctuating electric conductivity

Rüdiger, G., Küker, M. & Käpylä, P. J., 1 Jan 2020, In : Journal of Plasma Physics. 905860318.

Research output: Contribution to journalArticleScientificpeer-review

Magnetohydrodynamical origin of eclipsing time variations in post-common-envelope binaries for solar mass secondaries

Navarrete, F. H., Schleicher, D. R. G., Kaepylae, P. J., Schober, J., Voelschow, M. & Mennickent, R. E., Jan 2020, In : Monthly Notices of the Royal Astronomical Society. 491, 1, p. 1043-1056 14 p.

Research output: Contribution to journalArticleScientificpeer-review

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2 Citations (Scopus)
23 Downloads (Pure)

Sensitivity to luminosity, centrifugal force, and boundary conditions in spherical shell convection

Käpylä, P. J., Gent, F. A., Olspert, N., Käpylä, M. J. & Brandenburg, A., 14 Apr 2020, In : GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS. 114, 1-2, p. 8-34

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Turbulent viscosity and magnetic Prandtl number from simulations of isotropically forced turbulence

Käpylä, P. J., Rheinhardt, M., Brandenburg, A. & Käpylä, M. J., 1 Apr 2020, In : Astronomy and Astrophysics. 636, 12 p., A93.

Research output: Contribution to journalArticleScientificpeer-review

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2 Downloads (Pure)
2019

Antisolar differential rotation of slowly rotating cool stars

Rüdiger, G., Küker, M., Käpylä, P. J. & Strassmeier, K. G., 1 Oct 2019, In : Astronomy and Astrophysics. 630, p. 1-9 A109.

Research output: Contribution to journalArticleScientificpeer-review

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2 Citations (Scopus)
45 Downloads (Pure)

Effects of a subadiabatic layer on convection and dynamos in spherical wedge simulations

Käpylä, P., Viviani, M., Käpylä, M., Brandenburg, A. & Spada, F., 4 Mar 2019, In : GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS. 113, 1-2, p. 149-183 35 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
5 Citations (Scopus)

Effects of small-scale dynamo and compressibility on the Λ effect

Käpylä, P. J., 1 Jan 2019, In : Astronomische Nachrichten.

Research output: Contribution to journalArticleScientificpeer-review

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1 Citation (Scopus)
32 Downloads (Pure)

f-mode strengthening from a localised bipolar subsurface magnetic field

Singh, N. K., Raichur, H., Käpylä, M. J., Rheinhardt, M., Brandenburg, A. & Käpylä, P. J., 1 Jan 2019, In : GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS. p. 1-17

Research output: Contribution to journalArticleScientificpeer-review

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1 Citation (Scopus)
59 Downloads (Pure)

Magnetic and rotational quenching of the Λ effect

Käpylä, P., Feb 2019, In : Astronomy and Astrophysics. 622, 14 p., A195.

Research output: Contribution to journalArticleScientificpeer-review

Open Access

Overshooting in simulations of compressible convection

Käpylä, P., 2019, In : Astronomy & Astrophysics. 631

Research output: Contribution to journalArticleScientificpeer-review

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37 Downloads (Pure)

Stellar Dynamos in the Transition Regime: Multiple Dynamo Modes and Antisolar Differential Rotation

Viviani, M., Kapyla, M. J., Warnecke, J., Kapyla, P. J. & Rheinhardt, M., 20 Nov 2019, In : Astrophysical Journal. 886, 1, 10 p., 21.

Research output: Contribution to journalArticleScientificpeer-review

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2 Citations (Scopus)
21 Downloads (Pure)

Turbulent viscosity and effective magnetic Pradntl number from simulations of isotropically forced turbulence

Käpylä, P., Rheinhardt, M., Brandenburg, A. & Käpylä, M., 2019, (Submitted) In : Astronomy & Astrophysics.

Research output: Contribution to journalArticleScientificpeer-review

2018

Bihelical Spectrum of Solar Magnetic Helicity and Its Evolution

Singh, N. K., Käpylä, M. J., Brandenburg, A., Käpylä, P. J., Lagg, A. & Virtanen, I., 20 Aug 2018, In : Astrophysical Journal. 863, 2, p. 1-11 182.

Research output: Contribution to journalArticleScientificpeer-review

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7 Citations (Scopus)
140 Downloads (Pure)

f-mode strengthening from a localized bipolar subsurface magnetic field

Singh, N., Raichur, H., Käpylä, M., Rheinhardt, M., Brandenburg, A. & Käpylä, P., 27 Aug 2018, (Submitted) In : GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS.

Research output: Contribution to journalArticleScientificpeer-review

Large-scale dynamos in rapidly rotating plane layer convection

Bushby, P. J., Käpylä, P. J., Masada, Y., Brandenburg, A., Favier, B., Guervilly, C. & Käpylä, M. J., 1 Apr 2018, In : Astronomy and Astrophysics. 612, p. 1-16 A97.

Research output: Contribution to journalArticleScientificpeer-review

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5 Citations (Scopus)
116 Downloads (Pure)

Small-scale dynamos in simulations of stratified turbulent convection

Käpylä, P. J., Käpylä, M. J. & Brandenburg, A., 2018, In : Astronomische Nachrichten. 339, 2-3, p. 127-133

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

The magnetic shear-current and Rädler effects in astrophysical turbulence

Brandenburg, A., Rheinhardt, M., Käpylä, M., Käpylä, P. & Singh, N. K., Sep 2018, (In preparation) In : Astrophysical Journal.

Research output: Contribution to journalArticleScientificpeer-review

Transition from axi- to nonaxisymmetric dynamo modes in spherical convection models of solar-like stars

Viviani, M., Warnecke, J., Käpylä, M. J., Käpylä, P. J., Olspert, N., Cole-Kodikara, E. M., Lehtinen, J. J. & Brandenburg, A., 1 Aug 2018, In : Astronomy and Astrophysics. 616, p. 1-19 A160.

Research output: Contribution to journalArticleScientificpeer-review

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13 Citations (Scopus)
90 Downloads (Pure)

Turbulent transport coefficients in spherical wedge dynamo simulations of solar-like stars

Warnecke, J., Rheinhardt, M., Tuomisto, S., Käpylä, P. J., Käpylä, M. J. & Brandenburg, A., 2018, In : Astronomy and Astrophysics. 609, p. 1-22 22 p., A51.

Research output: Contribution to journalArticleScientificpeer-review

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114 Downloads (Pure)
2017

Convection-driven spherical shell dynamos at varying Prandtl numbers

Käpylä, P. J., Käpylä, M. J., Olspert, N., Warnecke, J. & Brandenburg, A., 2017, In : Astronomy and Astrophysics. 599, 18 p., A4.

Research output: Contribution to journalArticleScientificpeer-review

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14 Citations (Scopus)
146 Downloads (Pure)

Extended Subadiabatic Layer in Simulations of Overshooting Convection

Käpylä, P. J., Rheinhardt, M., Brandenburg, A., Arlt, R., Käpylä, M. J., Lagg, A., Olspert, N. & Warnecke, J., 20 Aug 2017, In : Astrophysical Journal Letters. 845, 2, p. 1-6 L23.

Research output: Contribution to journalArticleScientificpeer-review

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18 Citations (Scopus)
146 Downloads (Pure)

Methods for compressible fluid simulation on GPUs using high-order finite differences

Pekkilä, J., Väisälä, M. S., Käpylä, M. J., Käpylä, P. J. & Anjum, O., Aug 2017, In : Computer Physics Communications. 217, p. 11-22

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
2016

Influence of a coronal envelope as a free boundary to global convective dynamo simulations

Warnecke, J., Käpylä, P. J., Käpylä, M. J. & Brandenburg, A., 1 Dec 2016, In : Astronomy and Astrophysics. 596, A115.

Research output: Contribution to journalArticleScientificpeer-review

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20 Citations (Scopus)
95 Downloads (Pure)

Magnetic flux concentrations from turbulent stratified convection

Käpylä, P. J., Brandenburg, A., Kleeorin, N., Käpylä, M. J. & Rogachevskii, I., 1 Apr 2016, In : Astronomy and Astrophysics. 588, p. 1-13 A150.

Research output: Contribution to journalArticleScientificpeer-review

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21 Citations (Scopus)
88 Downloads (Pure)

Multiple dynamo modes as a mechanism for long-term solar activity variations

Käpylä, M., Käpylä, P., Olspert, N., Brandenburg, A., Warnecke, J., Karak, B. B. & Pelt, J., May 2016, In : Astronomy and Astrophysics. 589, 24 p., 56.

Research output: Contribution to journalArticleScientificpeer-review

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90 Downloads (Pure)

Numerical Simulations of Convection with Kramers Opacity

Käpylä, P., Rheinhardt, M., Käpylä, M. & Brandenburg, A., 2016, (In preparation) In : Astronomy and Astrophysics.

Research output: Contribution to journalArticleScientificpeer-review

Robustness of oscillatory α 2 dynamos in spherical wedges

Cole, E., Brandenburg, A., Käpylä, P. J. & Käpylä, M. J., 1 Sep 2016, In : Astronomy and Astrophysics. 593, p. 1-9 A134.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
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6 Citations (Scopus)
88 Downloads (Pure)
2015

Dynamical quenching with non-local alpha and downward pumping

Brandenburg, A., Hubbard, A. & Käpylä, P., 2015, In : Astronomische Nachrichten. 336, 1, p. 91-96

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Magnetically controlled stellar differential rotation near the transition from solar to anti-solar profiles

Karak, B. B., Käpylä, P. J., Käpylä, M. J., Brandenburg, A., Olspert, N. & Pelt, J., 2015, In : Astronomy and Astrophysics. 576, 17 p., A26.

Research output: Contribution to journalArticleScientificpeer-review

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46 Citations (Scopus)
52 Downloads (Pure)

Testing turbulent closure models with convection simulations

Snellman, J. E., Käpylä, P., Käpylä, M., Rheinhardt, M. & Dintrans, B., 2015, In : Astronomische Nachrichten. 336, 1, p. 32-52

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
2014

An Azimuthal dynamo wave in spherical shell convection

Cole, E., Käpylä, P. J., Mantere, M. J. & Brandenburg, A., 2014, In : Astrophysical Journal Letters. 780, 2, 6 p., L22.

Research output: Contribution to journalArticleScientificpeer-review

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19 Citations (Scopus)
85 Downloads (Pure)

Confirmation of bistable stellar differential rotation profiles

Käpylä, P. J., Käpylä, M. J. & Brandenburg, A., 2014, In : Astronomy and Astrophysics. 570, 10 p., A43.

Research output: Contribution to journalArticleScientificpeer-review

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48 Citations (Scopus)
89 Downloads (Pure)

On the cause of solar-like equatorward migration in global convective dynamo simulations

Warnecke, J., Käpylä, P. J., Käpylä, M. J. & Brandenburg, A., 2014, In : Astrophysical Journal Letters. 796, 1, 6 p., L12.

Research output: Contribution to journalArticleScientificpeer-review

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30 Citations (Scopus)
92 Downloads (Pure)

Quantifying the effect of turbulent magnetic diffusion on the growth rate of the magneto-rotational instability

Väisälä, M. S., Brandenburg, A., Mitra, D., Käpylä, P. J. & Mantere, M. J., 2014, In : Astronomy and Astrophysics. 567, 10 p., A139.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
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3 Citations (Scopus)
135 Downloads (Pure)

Quenching and anisotropy of hydromagnetic turbulent transport

Karak, B. B., Rheinhardt, M., Brandenburg, A., Käpylä, P. J. & Käpylä, M. J., 2014, In : Astrophysical Journal. 795, 1, 16 p.

Research output: Contribution to journalArticleScientificpeer-review

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18 Citations (Scopus)
99 Downloads (Pure)
2013

Effects of enhanced stratification on equatorward dynamo wave propagation

Käpylä, P. J., Mantere, M., Cole, E., Warnecke, J. & Brandenburg, A., 20 Nov 2013, In : Astrophysical Journal. 778, 1, 41.

Research output: Contribution to journalArticleScientificpeer-review

59 Citations (Scopus)

Effects of strong stratification on equatorward dynamo wave propagation

Käpylä, P. J., Mantere, M. J., Cole, E., Warnecke, J. & Brandenburg, A., 2013, In : Astrophysical Journal. 778, p. 41

Research output: Contribution to journalArticleScientificpeer-review

Flux concentrations in turbulent convection

Käpylä, P. J., Brandenburg, A., Kleeorin, N., Mantere, M. J. & Rogachevskii, I., 2013, IAU Symposium 294, Beijing, China, August 27 - August 31, 2013. Cambridge University Press, p. 283-288

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

Role of longitudinal activity complexes for solar and stellar dynamos

Mantere, M. J., Käpylä, P. J. & Pelt, J., 2013, IAU Symposium 294, Beijing, China, August 27 - August 31. Cambridge University Press, p. 175-186

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

Solar-like differential rotation and equatorward migration in a convective dynamo with a coronal envelope

Warnecke, J., Käpylä, P. J., Mantere, M. J. & Brandenburg, A., 2013, IAU Symposium 294, Beijing, China, August 27 - August 31, 2013. p. 307-312

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

Spoke-like differential rotation in a convective dynamo with a coronal envelope

Warnecke, J., Käpylä, P. J., Mantere, M. J. & Brandenburg, A., 2013, In : PROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION. 778, 2, p. 141

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)