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N. Olspert
Researcher at Max Planck Society
Publications - 35
Citations - 891
N. Olspert is an academic researcher from Max Planck Society. The author has contributed to research in topics: Dynamo & Differential rotation. The author has an hindex of 15, co-authored 34 publications receiving 700 citations. Previous affiliations of N. Olspert include Aalto University & Tartu Observatory.
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Journal ArticleDOI
Magnetically controlled stellar differential rotation near the transition from solar to anti-solar profiles
Bidya Binay Karak,Petri J. Käpylä,Petri J. Käpylä,Maarit J. Käpylä,Axel Brandenburg,Axel Brandenburg,N. Olspert,Jaan Pelt +7 more
TL;DR: In this paper, the effect of a dynamo-generated magnetic field on the large-scale flows, particularly on the possibility of bistable behaviour of differential rotation, was studied. But the results were limited to a rotating spherical shell with a set of different radiative conductivities.
Journal ArticleDOI
Multiple dynamo modes as a mechanism for long-term solar activity variations
Maarit J. Käpylä,Petri J. Käpylä,Petri J. Käpylä,Petri J. Käpylä,N. Olspert,Axel Brandenburg,Jörn Warnecke,Jörn Warnecke,Bidya Binay Karak,Bidya Binay Karak,Jaan Pelt,Jaan Pelt +11 more
TL;DR: In this paper, the authors analyze a solution of a solar-like DNS that was evolved for roughly 80 magnetic cycles of 4.9 years and where epochs of irregular behavior are detected.
Journal ArticleDOI
Magnetically controlled stellar differential rotation near the transition from solar to anti-solar profiles
Bidya Binay Karak,Petri J. Käpylä,Petri J. Käpylä,Maarit J. Käpylä,Axel Brandenburg,Axel Brandenburg,N. Olspert,Jaan Pelt +7 more
TL;DR: In this paper, the effect of a dynamo-generated magnetic field on the large-scale flows, particularly on the possibility of bistable behavior of differential rotation, was studied, and it was shown that magnetic fields, self-consistently generated by dynamo action, significantly affect the flows.
Journal ArticleDOI
Convection-driven spherical shell dynamos at varying Prandtl numbers
TL;DR: In this article, the authors studied the dynamo and differential rotation regimes at varying levels of viscous, thermal, and magnetic diffusion in rotating spherical wedges at various thermal and magnetic Prandtl numbers.
Journal ArticleDOI
Extended subadiabatic layer in simulations of overshooting convection
Petri J. Käpylä,Petri J. Käpylä,Matthias Rheinhardt,Axel Brandenburg,Axel Brandenburg,Axel Brandenburg,R. Arlt,Maarit J. Käpylä,Andreas Lagg,N. Olspert,Jörn Warnecke +10 more
TL;DR: In this paper, numerical simulations of hydrodynamic overshooting convection in local Cartesian domains are presented, and it is shown that a substantial fraction of the lower part of the convection zone (CZ) is stable.