Centre of Excellence Research on Solar Long-Term Variability and Effects, ReSoLVE

Research Output

2013

Multiperiodicity, modulations and flip-flops in variable star light curves: II. Analysis of II Pegasus photometry during 1979-2010

Lindborg, M., Mantere, M. J., Olspert, N., Pelt, J., Hackman, T., Henry, G. W., Jetsu, L. & Strassmeier, K. G., 2013, In : Astronomy and Astrophysics. 559, p. 1-10 A97.

Research output: Contribution to journalArticleScientificpeer-review

13 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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21 Citations (Scopus)
88 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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54 Citations (Scopus)
96 Downloads (Pure)

Doppler images of DI Piscium 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 journalArticleScientificpeer-review

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2 Citations (Scopus)
81 Downloads (Pure)

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 journalArticleScientificpeer-review

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7 Citations (Scopus)
106 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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37 Citations (Scopus)
97 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

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3 Citations (Scopus)
141 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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21 Citations (Scopus)
114 Downloads (Pure)
2015

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 journalArticleScientificpeer-review

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6 Citations (Scopus)
145 Downloads (Pure)

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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49 Citations (Scopus)
57 Downloads (Pure)

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 journalArticleScientificpeer-review

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1 Citation (Scopus)
41 Downloads (Pure)

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 journalArticleScientificpeer-review

23 Citations (Scopus)

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)

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., 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 journalArticleScientificpeer-review

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96 Citations (Scopus)
106 Downloads (Pure)
2016

Gaussian Process Kernels for Popular State-Space Time Series Models

Grigorevskiy, A. & Karhunen, J., Jul 2016, Proc. of the Int. Joint. Conf. on Neural Networks (IJCNN 2016): (IJCNN 2016), Vancouver, Canada, July 2016. IEEE, p. 3354-3363 (International joint conference on neural networks).

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

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4 Citations (Scopus)
171 Downloads (Pure)

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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25 Citations (Scopus)
105 Downloads (Pure)

Magnetic fields of young solar twins

Rosén, L., Kochukhov, O., Hackman, T. & Lehtinen, J., 1 Sep 2016, In : Astronomy and Astrophysics. 593, p. 1-24 24 p., A35.

Research output: Contribution to journalArticleScientificpeer-review

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26 Citations (Scopus)
91 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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22 Citations (Scopus)
94 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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97 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)
92 Downloads (Pure)

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 journalArticleScientificpeer-review

7 Citations (Scopus)

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 journalArticleScientificpeer-review

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12 Citations (Scopus)
154 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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20 Citations (Scopus)
200 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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23 Citations (Scopus)
154 Downloads (Pure)

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 journalArticleScientificpeer-review

4 Citations (Scopus)

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

5 Citations (Scopus)

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 journalArticleScientificpeer-review

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2 Citations (Scopus)
85 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

8 Citations (Scopus)

Parallelizable sparse inverse formulation Gaussian processes (SpInGP)

Grigorevskiy, A., Lawrence, N. & Särkkä, S., 2017, 2017 IEEE International Workshop on Machine Learning for Signal Processing, MLSP 2017 - Proceedings. IEEE, 7 p. (IEEE International Workshop on Machine Learning for Signal Processing).

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

Open Access
3 Citations (Scopus)

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 journalArticleScientificpeer-review

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4 Citations (Scopus)
186 Downloads (Pure)

Supernova-regulated ISM. V. Space and Time Correlations

Hollins, J. F., Sarson, G. R., Shukurov, A., Fletcher, A. & Gent, F. A., 20 Nov 2017, In : Astrophysical Journal. 850, 1, p. 1-18

Research output: Contribution to journalArticleScientificpeer-review

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4 Citations (Scopus)
183 Downloads (Pure)

The distribution of mean and fluctuating magnetic fields in the multiphase interstellar medium

Evirgen, C. C., Gent, F. A., Shukurov, A., Fletcher, A. & Bushby, P., 1 Jan 2017, In : Monthly Notices of the Royal Astronomical Society. 464, p. L105-L109

Research output: Contribution to journalArticleScientificpeer-review

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98 Downloads (Pure)
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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8 Citations (Scopus)
149 Downloads (Pure)

Estimating activity cycles with probabilistic methods I. Bayesian Generalised Lomb-Scargle Periodogram with Trend

Olspert, N., Pelt, J., Käpylä, M. J. & Lehtinen, J. J., Jul 2018, In : Astronomy and Astrophysics. 615, p. 1-13 A111.

Research output: Contribution to journalArticleScientificpeer-review

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117 Downloads (Pure)

Estimating activity cycles with probabilistic methods II: The Mount Wilson Ca H&K data

Olspert, N., Lehtinen, J. J., Käpylä, M. J., Pelt, J. & Grigorievskiy, A., 2018, In : Astronomy and Astrophysics. 619, p. 1-20 A6.

Research output: Contribution to journalArticleScientificpeer-review

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91 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

High-Frequency Geomagnetic Fluctuations at Auroral Oval and Polar Cap

Peitso, P., Tanskanen, E. I., Pulkkinen, T. I. & Mursula, K., Aug 2018, In : Space Weather. 16, 8, p. 1057-1072 16 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
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1 Citation (Scopus)
140 Downloads (Pure)

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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7 Citations (Scopus)
124 Downloads (Pure)

Magnetic field effects on the ISM structure and galactic outflows

Shukurov, A., Evirgen, C. C., Fletcher, A., Bushby, P. J. & Gent, F. A., 2018.

Research output: Contribution to conferencePaperScientific

Magnetic Shocks and Substructures Excited by Torsional Alfvén Wave Interactions in Merging Expanding Flux Tubes

Snow, B., Fedun, V., Gent, F. A., Verth, G. & Erdélyi, R., 20 Apr 2018, In : Astrophysical Journal. 857, 2, p. 1-8 125.

Research output: Contribution to journalArticleScientificpeer-review

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6 Citations (Scopus)
119 Downloads (Pure)

Separating the scales in a compressible interstellar medium

Hollins, J. F., Sarson, G. R., Shukurov, A., Fletcher, A. & Gent, F. A., 2018, (Submitted) In : Monthly Notices of the Royal Astronomical Society.

Research output: Contribution to journalArticleScientificpeer-review

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

5 Citations (Scopus)

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

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12 Downloads (Pure)

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

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 journalArticleScientificpeer-review

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5 Citations (Scopus)
122 Downloads (Pure)

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 journalArticleScientificpeer-review

Open Access
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16 Citations (Scopus)
138 Downloads (Pure)

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

Open Access
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17 Citations (Scopus)
98 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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119 Downloads (Pure)