Mean-field dynamo theory has important applications in solar physics and galactic
magnetism. We discuss some of the many turbulence effects relevant to the generation of …

Abstract The Kodaikanal Observatory has provided long-term synoptic observations of
chromospheric activities in the Ca ii K line (393.34 nm) since 1907. This article investigates …

We investigate the effect of surface bipolar magnetic regions (BMRs) on the large-scale
dynamo distributed in the bulk of the convection zone. The study employs the non-linear …

We model the physical parameters of Solar Cycles 23 and 24 using a nonlinear dynamical
mean-field dynamo model that includes the formation and evolution of bipolar magnetic …

We study the relation between stellar dynamo-wave propagation and the structure of the
stellar magnetic field. Modeling dynamo waves by the well-known Parker migratory dynamo …

We used the elaborated earlier catalog of the magneto-morphological classes (MMC) of
active regions (ARs) to study 2046 ARs of the solar cycle (SC) 23 and 1507 ARs of the …

The temporal spectrum of the solar activity is more than just the main cycle. It contains
different timescales, which can be considered as continuous components of the activity …

Solar filaments are well-known tracers of polarity inversion lines that separate two opposite
magnetic polarities on the solar photosphere. Because observations of filaments began long …

This study is devoted to the interplay between the global dynamo and small-scale dynamo
and their mutual manifestations in the solar cycle. The cyclic variations of active regions …

The existence of magnetic fields in spiral galaxies is beyond doubt and is confirmed by both
observational data and theoretical models. Their generation occurs due to the dynamo …