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<p><span>ERC Consolidator Grant to Maarit Käpylä</span></p>

MPS-scientist Maarit Käpylä receives a Consolidator Grant from the European Research Commission to conduct the project "Building up a Unified Theory of Stellar Dynamos (UniSDyn)". more

<p><span>Estimating rotation periods and magnetic cycle lengths of active stars - PhD thesis by Nigul Olspert</span></p>

Nigul Olspert, M.Sc., will defend the dissertation "From periodic to cyclic processes in stellar magnetic activity research: time series analysis methods and their applications" on Friday 16 November at 12 noon at the Aalto University School of Science, lecture hall AS1, Maarintie 8, Espoo.  more

Application of probabilistic methods to Mount Wilson Ca H&K data confirms robustness of the inactive branch

The existence of "activity branches", that is stellar cycles clustering in groups that show linear dependencies as function of rotation, has been debated for years. Such dependencies have crucial implications on how to explain stellar magnetism in terms of dynamo theory. In this study we applied novel time series analysis techniques to one of the longest stellar activity database. more

<p><span>Best poster award for Mariangela Viviani</span></p>

During the IAUS340 in Jaipur (India) Mariangela Viviani was rewarded with the "Best Poster Award" in her session "VII: Solar Stellar Dynamo". more

<p>Turbulent transport coefficients measured from stellar convective dynamos</p>

Turbulent effects play an important role in the magnetic generation of the Sun and stars. Unfortunately, at the moment observation are not able to reveal these effects. On way to understand how these turbulent effects can generate magnetic field via dynamo mechanisms is to study global 3 dimensional magnetohydrodynamic simulation of the Sun and stars...  more

<p>Extended subadiabatic layer in simulations of overshooting convection</p>

Using three-dimensional simulations with smoothly varying heat conduction profile we found solutions where a substantial fraction of the lower part of the convection zone is stably stratified according to the Schwarzschild criterion. If these results carry over to the Sun... more

<p><span>GPUs made useful in turbulence modelling</span></p>

 We have developed an effective method for accelerating fluid dynamics calculations with high-order precision on graphics processing units (GPUs). This is done by efficient use of GPU memory with cache blocking and by dividing computation algorithms into memory efficient chunks. Our Nvidia CUDA based, proof of concept code Astaroth is able to achieve 3.6 times speedup in comparison to the reference code, which in practice allows for a week-long turbulence simulation to be performed within a couple of days. The method is published in Pekkilä, Väisälä et al. (2017). more

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