Prof. Doc. Dr. Maarit Käpylä

Professor (Associate Professor)

Research outputs

  1. 2020
  2. Published
  3. 2019
  4. Published

    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 journalArticle

  5. Published

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

    Cole-Kodikara, E. M., Kaepylae, M. J., Lehtinen, J. J., Hackman, T., Ilyin, I., Piskunov, N. & Kochukhov, O., 13 Sep 2019, In : Astronomy & Astrophysics. 629, p. 1-9 9 p., 120.

    Research output: Contribution to journalArticle

  6. Published
  7. Published

    Starspot activity of HD199178 Doppler images from 1994-2017

    Hackman, T., Ilyin, I., Lehtinen, J. J., Kochukhov, O., Kaepylae, M. J., Piskunov, N. & Willamo, T., 16 May 2019, In : Astronomy & Astrophysics. 625, 10 p., 79.

    Research output: Contribution to journalArticle

  8. Published

    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 journalArticle

  9. Published

    Long-term spot monitoring of the young solar analogue V889 Herculis

    Willamo, T., Hackman, T., Lehtinen, J. J., Käpylä, M. J., Ilyin, I., Henry, G. W., Jetsu, L., Kochukhov, O. & Piskunov, N., 1 Feb 2019, In : Astronomy and Astrophysics. 622, A170.

    Research output: Contribution to journalArticle

  10. Published

    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 journalArticle

  11. Published

    Modelling supernova-driven turbulence

    Gent, F. A., Mac Low, M. M., Käpylä, M. J., Sarson, G. R. & Hollins, J. F., 1 Jan 2019, In : GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS.

    Research output: Contribution to journalArticle

  12. 2018
  13. Published

    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 journalArticle

  14. Published

    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 journalArticle

  15. Published
  16. Published

    The supernova-regulated ISM: IV. A comparison of simulated polarization with Planck observations

    Väisälä, M., Gent, F., Juvela, M. & Käpylä, M., 1 Jun 2018, In : Astronomy and Astrophysics. 614, A101.

    Research output: Contribution to journalArticle

  17. Published

    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 journalArticle

  18. Published

    The supernova-regulated ISM. III. Generation of vorticity, helicity, and mean flows

    Käpylä, M., Gent, F., Väisälä, M. & Sarson, G., Mar 2018, In : Astronomy and Astrophysics. 611, 19 p., A15.

    Research output: Contribution to journalArticle

  19. Published
  20. Published

    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 journalArticle

  21. Published

    Study of Magnetic Complexity of Solar Active Regions from 1996 to 2017

    Nikbakhsh, S., Tanskanen, E., Hackman, T. & Käpylä, M., 2018.

    Research output: Contribution to conferenceAbstractScientific

  22. Published

    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 journalArticle

  23. 2017
  24. Published

    Long-term variations of turbulent transport coefficients in a solar-like convective dynamo simulation

    Gent, F., Käpylä, M. & Warnecke, J., Oct 2017, In : Astronomische Nachrichten. 338, 8, p. 885-895 11 p.

    Research output: Contribution to journalArticle

  25. Published

    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 journalArticle

  26. Published

    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 journalArticle

  27. Published

    Method of frequency dependent correlations: Investigating the variability of total solar irradiance

    Pelt, J., Käpylä, M. & Olspert, N., 1 Apr 2017, In : Astronomy and Astrophysics. 600, p. 1-19 A9.

    Research output: Contribution to journalArticle

  28. Published

    Method for estimating cycle lengths from multidimensional time series: Test cases and application to a massive 'in silico' dataset

    Olspert, N., Kapyla, M. J. & Pelt, J., 2 Feb 2017, Proceedings - 2016 IEEE International Conference on Big Data, Big Data 2016. IEEE, p. 3214-3223 10 p. 7840977

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  29. Published

    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 journalArticle

  30. Published

    Solar Cycle Occurrence of Alfvénic Fluctuations and Related Geo-Efficiency

    Tanskanen, E., Snekvik, K., Slavin, J. A., Pérez-Suárez, D., Viljanen, A., Goldstein, M. L., Käpylä, M. J., Hynönen, R., Häkkinen, L. V. T. & Mursula, K., 2017, In : Journal of geophysical research: Space physics. 122, 10, p. 9848-9857 10 p.

    Research output: Contribution to journalArticle

  31. 2016
  32. Published

    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 journalArticle

  33. Published

    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 journalArticle

  34. Published

    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 journalArticle

  35. Published

    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 journalArticle

  36. Published

    Zeeman-Doppler imaging of active young solar-type stars

    Hackman, T., Lehtinen, J., Rosén, L., Kochukhov, O. & Käpylä, M. J., 1 Mar 2016, In : Astronomy and Astrophysics. 587, p. 1-7 A28.

    Research output: Contribution to journalArticle

  37. Published

    Singular Value Decomposition update and its application to (Inc)-OP-ELM

    Grigorevskiy, A., Miche, Y., Käpylä, M. & Lendasse, A., 22 Jan 2016, In : Neurocomputing. 174, p. 99-108 10 p.

    Research output: Contribution to journalArticle

  38. 2015
  39. Published

    Doppler imaging of LQ Hydrae for 1998-2002

    Cole, E. M., Hackman, T., Käpylä, M. J., Ilyin, I., Kochukhov, O. & Piskunov, N., 2015, In : Astronomy and Astrophysics. 581, 9 p., A69.

    Research output: Contribution to journalArticle

  40. Published

    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 journalArticle

  41. Published

    Multiperiodicity, modulations, and flip-flops in variable star light curves - III. Carrier fit analysis of LQ Hydrae photometry for 1982-2014

    Olspert, N., Käpylä, M. J., Pelt, J., Cole, E. M., Hackman, T., Lehtinen, J. & Henry, G. W., 2015, In : Astronomy and Astrophysics. 577, 13 p., A120.

    Research output: Contribution to journalArticle

  42. Published

    Statistical Study of Strong and Extreme Geomagnetic Disturbances and Solar Cycle Characteristics

    Kilpua, E. K. J., Olspert, N., Grigorevskiy, A., Käpylä, M., Tanskanen, E. I., Miyahara, H., Kataoka, R., Pelt, J. & Liu, Y. D., 2015, In : Astrophysical Journal. 806, 2, p. 272

    Research output: Contribution to journalArticle

  43. Published

    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 journalArticle

  44. Published

    The Maunder minimum (1645-1715) was indeed a grand minimum: A reassessment of multiple datasets

    Usoskin, I. G., Arlt, R., Asvestari, E., Hawkins, E., Käpylä, M., Kovaltsov, G. A., Krivova, N., Lockwood, M., Mursula, K., "O'Reilly", J. & 6 others, Owens, M., Scott, C. J., Sokoloff, D. D., Solanki, S. K., Soon, W. & Vaquero, J. M., 2015, In : Astronomy and Astrophysics. 581, 19 p., A95.

    Research output: Contribution to journalArticle

  45. 2014
  46. Published

    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 journalArticle

  47. Published

    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 journalArticle

  48. Published

    Doppler images of DI Psc during 2004-2006

    Lindborg, M., Hackman, T., Mantere, M. J., Korhonen, H., Ilyin, I., Kochukhov, O. & Piskunov, N., 2014, In : Astronomy and Astrophysics. 562, 7 p., A139.

    Research output: Contribution to journalArticle

  49. Published

    Forecasting the Outbursts of the Photometry Light Curve of Star V363 Lyr

    Grigorievskiy, A., Mantere, M., Akusok, A., Eirola, E. & Lendasse, A., 2014, International Work Conference on Time Series Analysis 2014, Granada. Ignacio Rojas Ruiz, G. R. G. (ed.). Granada, p. 520-531

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  50. Published

    High-resolution ammonia mapping of the very young protostellar core Chamaeleon-MMS1

    Väisälä, M. S., Harju, J., Mantere, M. J., Miettinen, O., Sault, R. S., Walmsley, C. M. & Whiteoak, J. B., 2014, In : Astronomy and Astrophysics. 564, 15 p., A99.

    Research output: Contribution to journalArticle

  51. Published

    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 journalArticle

  52. Published

    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 journalArticle

  53. Published

    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 journalArticle

  54. 2013
  55. Published

    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 journalArticle

  56. Published

    The supernova-regulated ISM - I. The multi-phase structure

    Gent, F. A., Shukurov, A., Fletcher, A., Sarson, G. R. & Mantere, M. J., Jun 2013, In : Monthly Notices of the Royal Astronomical Society. 432, 2, p. 1396-1423 28 p.

    Research output: Contribution to journalArticle

  57. Published

    The supernova-regulated ISM - II. The mean magnetic field

    Gent, F. A., Shukurov, A., Sarson, G. R., Fletcher, A. & Mantere, M. J., Mar 2013, In : Monthly Notices of the Royal Astronomical Society. 430, 1, p. L40-L44 5 p.

    Research output: Contribution to journalArticle

  58. Published

    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 journalArticle

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