98 citations · 111 across the 3 of their papers we have counts for
3 papers
Method for estimating cycle lengths from multidimensional time series: Test cases and application to a massive "in silico" dataset
Nigul Olspert, Maarit Käpylä, Jaan Pelt
Many real world systems exhibit cyclic behavior that is, for example, due to the nearly harmonic oscillations being perturbed by the strong fluctuations present in the regime of si…
Multiple dynamo modes as a mechanism for long-term solar activity variations
Maarit J. Käpylä, Petri J. Käpylä, Nigul Olspert +4
Solar magnetic activity shows both smooth secular changes, such as the Grand Modern Maximum, and quite abrupt drops that are denoted as Grand Minima. Direct numerical simulations (…
Multiperiodicity, modulations and flip-flops in variable star light curves III. Carrier fit analysis of LQ Hya photometry for 1982-2014
Nigul Olspert, Maarit J. Käpylä, Jaan Pelt +4
We study LQ Hya photometry for 1982-2014 with the carrier fit (CF) -method and compare our results to earlier photometric analysis and recent Doppler imaging maps. We first utilize…