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11 papers · 2 filters
Doppler images and the underlying dynamo. The case of AF Leporis
S. P. Järvinen, R. Arlt, T. Hackman +6
The (Zeeman-)Doppler imaging studies of solar-type stars very often reveal large high-latitude spots. This also includes F stars that possess relatively shallow convection zones, i…
Dynamical quenching with non-local alpha and downward pumping
A. Brandenburg, A. Hubbard, P. J. Käpylä
In light of new results, the one-dimensional mean-field dynamo model of Brandenburg & Kapyla (2007) with dynamical quenching and a nonlocal Babcock-Leighton alpha effect is re-exam…
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…
On the cause of solar-like equatorward migration in global convective dynamo simulations
Jörn Warnecke, Petri J. Käpylä, Maarit J. Käpylä +1
We present results from four convectively-driven stellar dynamo simulations in spherical wedge geometry. All of these simulations produce cyclic and migrating mean magnetic fields.…
A Space Weather Mission Concept: Observatories of the Solar Corona and Active Regions (OSCAR)
Antoine Strugarek, Nils Janitzek, Arrow Lee +14
Coronal Mass Ejections (CMEs) and Corotating Interaction Regions (CIRs) are major sources of magnetic storms on Earth and are therefore considered to be the most dangerous space we…
Magnetically controlled stellar differential rotation near the transition from solar to anti-solar profiles
Bidya Binay Karak, Petri J. Kapyla, Maarit J. Kapyla +3
Late-type stars rotate differentially owing to anisotropic turbulence in their outer convection zones. The rotation is called solar-like (SL) when the equator rotates fastest and a…