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13 papers · 2 filters
A new model for heating of Solar North Polar Coronal Hole
E. Devlen, D. Zengin Çamurdan, M. Yardımcı +1
This paper presents a new model of North Polar Coronal Hole (NPCH) to study dissipation/propagation of MHD waves. We investigate the effects of the isotropic viscosity and heat con…
The dynamics of Wolf numbers based on nonlinear dynamo with magnetic helicity: comparisons with observations
Ya. Kleeorin, N. Safiullin, N. Kleeorin +3
We investigate the dynamics of solar activity using a nonlinear one-dimensional dynamo model and a phenomenological equation for the evolution of Wolf numbers. This system of equat…
The detailed chemical composition of the terrestrial planet host Kepler-10
F. Liu, D. Yong, M. Asplund +7
Chemical abundance studies of the Sun and solar twins have demonstrated that the solar composition of refractory elements is depleted when compared to volatile elements, which coul…
Magnetic flux concentrations from turbulent stratified convection
P. J. Käpylä, A. Brandenburg, N. Kleeorin +2
(abridged) Context: The mechanisms that cause the formation of sunspots are still unclear. Aims: We study the self-organisation of initially uniform sub-equipartition magnetic fiel…
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 (…
Gaia FGK Benchmark Stars: Effective temperatures and surface gravities
U. Heiter, P. Jofré, B. Gustafsson +3
Large Galactic stellar surveys and new generations of stellar atmosphere models and spectral line formation computations need to be subjected to careful calibration and validation…