Käpylä, M. J.; Rheinhardt, M.; Brandenburg, A.: Compressible Test-field Method and Its Application to Shear Dynamos. The Astrophysical Journal 932, p. 8 (2022)
Lehtinen, J. J.; Käpylä, M. J.; Hackman, T.; Kochukhov, O.; Willamo, T.; Marsden, S.C.; Jeffers, S. V.; Henry, G.W.; Jetsu, L.: Topological changes in the magnetic field of LQ Hya during an activity minimum. Astronomy and Astrophysics 660, A141 (2022)
Pekkilä, J.; Väisälä, M. S.; Käpylä, M. J.; Rheinhardt, M.; Lappiae, O.: Scalable communication for high-order stencil computations using CUDA-aware MPI. Parallel Computing 111, 102904 (2022)
Snellman, J. E.; Barrio, R. A.; Kaski, K. K.; Käpylä, M. J.: Modelling the interplay between epidemics and regional socio-economics. Physica A Statistical Mechanics and its Applications 604, p. 127696 (2022)
Willamo, T.; Lehtinen, J. J.; Hackman, T.; Käpylä, M. J.; Kochukhov, O.; Jeffers, S. V.; Korhonen, H.; Marsden, S. C.: Zeeman-Doppler imaging of five young solar-type stars. Astronomy and Astrophysics 659, p. A71 (2022)
Barekat, A.; Käpylä, M. J.; Käpylä, P.J.; Gilson, E.P.; Ji, H.: Generation of mean flows in rotating anisotropic turbulence: The case of solar near-surface shear layer. Astronomy and Astrophysics 655, A79 (2021)
Gent, F. A.; Mac Low, M.-M.; Käpylä, M. J.; Singh, N. K.: Small-scale Dynamo in Supernova-driven Interstellar Turbulence. The Astrophysical Journal Letters 910 (2), L15 (2021)
Prabhu, A. P.; Singh, N. K.; Käpylä, M. J.; Lagg, A.: Inferring magnetic helicity spectrum in spherical domains: Method and example applications. Astronomy and Astrophysics 654, A3 (2021)
Väisälä, M. S.; Pekkilä, J.; Käpylä, M. J.; Rheinhardt, M.; Shang, H.; Krasnopolsky, R.: Interaction of Large- and Small-scale Dynamos in Isotropic Turbulent Flows from GPU-accelerated Simulations. The Astrophysical Journal 907 (2), 83 (2021)
Viviani, M.; Käpylä, M. J.: Physically motivated heat conduction treatment in simulations of solar-like stars: effects on dynamo transitions. Astronomy and Astrophysics 645, A141 (2021)
Warnecke, J.; Rheinhardt, M.; Viviani, M.; Gent, F. A.; Tuomisto, S.; Käpylä, M. J.: Investigating Global Convective Dynamos with Mean-field Models: Full Spectrum of Turbulent Effects Required. The Astrophysical Journal Letters 919 (2), L13 (2021)
Käpylä, M. J.; Alvarez Vizoso, J.; Rheinhardt, M.; Brandenburg, A.; Käpylä, P.; Singh, N. K.: On the Existence of Shear-current Effects in Magnetized Burgulence. The Astrophysical Journal 905 (2), 179 (2020)
Käpylä, P. J.; Gent, F. A.; Olspert, N.; Käpylä, M. J.; Brandenburg, A.: Sensitivity to luminosity, centrifugal force, and boundary conditions in spherical shell convection. Geophysical and Astrophysical Fluid Dynamics 14 (1-2), pp. 8 - 34 (2020)
Käpylä, P. J.; Rheinhardt, M.; Brandenburg, A.; Käpylä, M. J.: Turbulent viscosity and magnetic Prandtl number from simulations of isotropically forced turbulence. Astronomy and Astrophysics 636, A93 (2020)
Lehtinen, J.; Käpylä, M. J.; Olspert,, N.; Spada, F.: A Knee-Point in the Rotation-Activity Scaling of Late-type Stars with a Connection to Dynamo Transitions. (submitted)
Lehtinen, J.; Spada, F.; Käpylä, M. J.; Olspert, N.; Käpylä, P. J.: Common dynamo scaling in slowly rotating young and evolved stars. Nature astronomy 4, pp. 658 - 662 (2020)
Prabhu, A.; Brandenburg, A.; Käpylä, M. J.; Lagg, A.: Helicity proxies from linear polarisation of solar active regions. Astronomy and Astrophysics 641, A46 (2020)
Singh, N. K.; Raichur, H.; Käpylä, M. J.; Rheinhardt, M.; Brandenburg, A.; Käpylä, P. J.: f-mode strengthening from a localised bipolar subsurface magnetic field. Geophysical and Astrophysical Fluid Dynamics 114 (1-2), pp. 196 - 212 (2020)
The Planetary Plasma Environments group (PPE) has a strong heritage in the exploration of planetary magnetospheres and space plasma interactions throughout the solar system. It has contributed instruments to several past missions that flew-by or orbited Jupiter (Galileo, Cassini, Ulysses). The PPE participates in the JUICE mission by contributing hardware and scientific expertise to the Particle Environment Package (PEP).
Application deadline 1 October 2024. PhD projects in planetary science, solar and stellar physics, solar magnetism, heliophysics, helioseismology, asteroseismology, ...
First Light for Sunrise III: the first tests with real sunlight were successful. The balloon-borne solar observatory should be ready for launch at the end of May.
In analyzing solar observations from the 19th century, scientists are turning to amateur researchers for help. The project will allow to better understand the history of our star.