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Research Output

  • 14 Article
  • 1 Conference contribution
  • 1 Doctoral Thesis
2020

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)
2018

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

Open Access
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112 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

Open Access
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85 Downloads (Pure)
Open Access

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
File
13 Citations (Scopus)
90 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

Open Access
File
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

Open Access
File
18 Citations (Scopus)
146 Downloads (Pure)

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

3 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

Open Access
File
1 Citation (Scopus)
82 Downloads (Pure)
2016

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

Open Access
File
90 Downloads (Pure)
2015

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

Open Access
File
46 Citations (Scopus)
52 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

Open Access
File
1 Citation (Scopus)
37 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

21 Citations (Scopus)
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)
2011

Multiperiodicity, modulations and flip-flops in variable star light curves: I. Carrier fit method

Pelt, J., Olspert, N., Mantere, M. J. & Tuominen, I., 2011, In : Astronomy and Astrophysics. 535, p. 1-12 A23.

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Towards the automatic estimation of time delays of gravitational lenses

Hirv, A., Olspert, N. & Pelt, J., 2011, In : Baltic Astronomy. 20, 2, p. 125-144 20 p.

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)