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Building up a Unified Theory of Stellar Dynamos

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Publications

Modeling the interplay between epidemics and regional socio-economics

Author(s): Jan E. Snellman; Rafael A. Barrio; Kimmo K. Kaski; Maarit J. Käpylä
Published in: Physica A, 2, 2022, Page(s) under review, ISSN 0378-4371
Publisher: Elsevier BV
DOI: 10.21203/rs.3.rs-500405/v1

Interaction of Large- and Small-scale Dynamos in Isotropic Turbulent Flows from GPU-accelerated Simulations

Author(s): Miikka S. Väisälä, Johannes Pekkilä, Maarit J. Käpylä, Matthias Rheinhardt, Hsien Shang, Ruben Krasnopolsky
Published in: The Astrophysical Journal, 907/2, 2021, Page(s) 83, ISSN 0004-637X
Publisher: University of Chicago Press
DOI: 10.3847/1538-4357/abceca

Rotational dependence of turbulent transport coefficients in global convective dynamo simulations of solar-like stars

Author(s): J. Warnecke, M. J. Käpylä
Published in: Astronomy & Astrophysics, 642, 2020, Page(s) A66, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/201936922

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

Author(s): P. J. Käpylä, M. Rheinhardt, A. Brandenburg, M. J. Käpylä
Published in: Astronomy & Astrophysics, 636, 2020, Page(s) A93, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/201935012

Non-Fourier description of heat flux evolution in 3D MHD simulations of the solar corona

Author(s): Warnecke, Jörn; Bingert, Sven
Published in: Geophysical & Astrophysical Fluid Dynamics, 2020, Page(s) Volume 114, Issue 1-2, p.261-281, ISSN 0309-1929
Publisher: Taylor & Francis
DOI: 10.1080/03091929.2019.1670173

Inferring magnetic helicity spectrum in spherical domains

Author(s): Prabhu, A. P.; Singh, N. K.; Käpylä, M. J.; Lagg, A.
Published in: Astronomy & Astrophysics, 1, 2021, Page(s) Vol. 654, Article ID A3, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/202141101

Helicity proxies from linear polarisation of solar active regions

Author(s): A. Prabhu, A. Brandenburg, M. J. Käpylä, A. Lagg
Published in: Astronomy & Astrophysics, 641, 2020, Page(s) A46, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/202037614

On the Existence of Shear-current Effects in Magnetized Burgulence

Author(s): Maarit J. Käpylä, Javier Álvarez Vizoso, Matthias Rheinhardt, Axel Brandenburg, Nishant K. Singh
Published in: The Astrophysical Journal, 905/2, 2020, Page(s) 179, ISSN 0004-637X
Publisher: University of Chicago Press
DOI: 10.3847/1538-4357/abc1e8

Stellar X-rays and magnetic activity in 3D MHD coronal models

Author(s): J. Zhuleku, J. Warnecke, H. Peter
Published in: Astronomy & Astrophysics, 652, 2021, Page(s) A32, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/202040192

Scalable communication for high-order stencil computations using CUDA-aware MPI

Author(s): Pekkilä, Johannes; Väisälä, Miikka S.; Käpylä, Maarit J.; Rheinhardt, Matthias; Lappi, Oskar
Published in: Parallel Computing, 1, 2022, ISSN 0167-8191
Publisher: Elsevier BV

The Pencil Code, a modular MPI code for partial differential equations and particles: multipurpose and multiuser-maintained

Author(s): The Collaboration, Axel Brandenburg, Anders Johansen, Philippe Bourdin, Wolfgang Dobler, Wladimir Lyra, Matthias Rheinhardt, Sven Bingert, Nils Haugen, Antony Mee, Frederick Gent, Natalia Babkovskaia, Chao-Chin Yang, Tobias Heinemann, Boris Dintrans, Dhrubaditya Mitra, Simon Candelaresi, Jörn Warnecke, Petri Käpylä, Andreas Schreiber, Piyali Chatterjee, Maarit Käpylä, Xiang-Yu Li, Jonas Krüg
Published in: Journal of Open Source Software, 6/58, 2021, Page(s) 2807, ISSN 2475-9066
Publisher: JOSS
DOI: 10.21105/joss.02807

Topological changes in the magnetic field of LQ Hya during an activity minimum

Author(s): Lehtinen, Jyri J.; Käpylä, Maarit J.; Hackman, Thomas; Kochukhov, Oleg; Willamo, Teemu; Marsden, Stephen C.; Jeffers, Sandra V.; Henry, Gregory W.; Jetsu, Lauri
Published in: Astronomy & Astrophysics, 3, 2021, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/202141649

Spot evolution on LQ Hya from 2006–2017: temperature maps based on SOFIN and FIES data

Author(s): Elizabeth M. Cole-Kodikara, Maarit J. Käpylä, Jyri J. Lehtinen, Thomas Hackman, Ilya V. Ilyin, Nikolai Piskunov, Oleg Kochukhov
Published in: Astronomy & Astrophysics, 629, 2019, Page(s) A120, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/201935729

Differences in the solar cycle variability of simple and complex active regions during 1996–2018

Author(s): S. Nikbakhsh, E. I. Tanskanen, M. J. Käpylä, T. Hackman
Published in: Astronomy & Astrophysics, 629, 2019, Page(s) A45, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/201935486

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

Author(s): M. Viviani, M. J. Käpylä, J. Warnecke, P. J. Käpylä, M. Rheinhardt
Published in: The Astrophysical Journal, 886/1, 2019, Page(s) 21, ISSN 1538-4357
Publisher: IOPScience
DOI: 10.3847/1538-4357/ab3e07

f -mode strengthening from a localised bipolar subsurface magnetic field

Author(s): Nishant K. Singh, Harsha Raichur, Maarit J. Käpylä, Matthias Rheinhardt, Axel Brandenburg, Petri J. Käpylä
Published in: Geophysical & Astrophysical Fluid Dynamics, 114/1-2, 2020, Page(s) 196-212, ISSN 0309-1929
Publisher: Taylor & Francis
DOI: 10.1080/03091929.2019.1653461

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

Author(s): P. J. Käpylä, F. A. Gent, N. Olspert, M. J. Käpylä, A. Brandenburg
Published in: Geophysical & Astrophysical Fluid Dynamics, 114/1-2, 2020, Page(s) 8-34, ISSN 0309-1929
Publisher: Taylor & Francis
DOI: 10.1080/03091929.2019.1571586

Common dynamo scaling in slowly rotating young and evolved stars

Author(s): Jyri J. Lehtinen, Federico Spada, Maarit J. Käpylä, Nigul Olspert, Petri J. Käpylä
Published in: Nature Astronomy, 4/7, 2020, Page(s) 658-662, ISSN 2397-3366
Publisher: Nature Publishing Group
DOI: 10.1038/s41550-020-1039-x

Stellar coronal X-ray emission and surface magnetic flux

Author(s): J. Zhuleku, J. Warnecke, H. Peter
Published in: Astronomy & Astrophysics, 640, 2020, Page(s) A119, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/202038022

Generation of mean flows in rotating anisotropic turbulence: The case of solar near-surface shear layer

Author(s): A. Barekat, M. J. Käpylä, P. J. Käpylä, E. P. Gilson, H. Ji
Published in: Astronomy & Astrophysics, 2021, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/202040052

Shapes of stellar activity cycles

Author(s): T. Willamo, T. Hackman, J. J. Lehtinen, M. J. Käpylä, N. Olspert, M. Viviani, J. Warnecke
Published in: Astronomy & Astrophysics, 638, 2020, Page(s) A69, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/202037666

A Knee Point in the Rotation–Activity Scaling of Late-type Stars with a Connection to Dynamo Transitions

Author(s): Jyri J. Lehtinen, Maarit J. Käpylä, Nigul Olspert, Federico Spada
Published in: The Astrophysical Journal, 910/2, 2021, Page(s) 110, ISSN 0004-637X
Publisher: University of Chicago Press
DOI: 10.3847/1538-4357/abe621

Physically motivated heat-conduction treatment in simulations of solar-like stars: effects on dynamo transitions

Author(s): M. Viviani, M. J. Käpylä
Published in: Astronomy & Astrophysics, 645, 2021, Page(s) A141, ISSN 0004-6361
Publisher: Springer Verlag
DOI: 10.1051/0004-6361/202038603

Small-scale Dynamo in Supernova-driven Interstellar Turbulence

Author(s): Frederick A. Gent, Mordecai-Mark Mac Low, Maarit J. Käpylä, Nishant K. Singh
Published in: The Astrophysical Journal Letters, 910/2, 2021, Page(s) L15, ISSN 2041-8205
Publisher: Institute of Physics Publishing
DOI: 10.3847/2041-8213/abed59

Investigating Global Convective Dynamos with Mean-field Models: Full Spectrum of Turbulent Effects Required

Author(s): Jörn Warnecke; Matthias Rheinhardt; Mariangela Viviani; Frederick A. Gent; Simo Tuomisto; Maarit J. Käpylä
Published in: The Astrophysical Journal Letters, 1, 2021, Page(s) Vol. 919, L13, ISSN 0004-637X
Publisher: University of Chicago Press
DOI: 10.3847/2041-8213/ac1db5

Compressible test-field method and its application to shear dynamos

Author(s): Käpylä, Maarit J.; Rheinhardt, Matthias; Brandenburg, Axel
Published in: The Astrophysical Journal, 2, 2022, ISSN 0004-637X
Publisher: University of Chicago Press