B. B. Karak

Publications62
h-index19
Citations1,054
Highly Influential Citations38
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Magnetically controlled stellar differential rotation near the transition from solar to anti-solar profiles
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 anti-solar (AS)…
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IMPORTANCE OF MERIDIONAL CIRCULATION IN FLUX TRANSPORT DYNAMO: THE POSSIBILITY OF A MAUNDER-LIKE GRAND MINIMUM
Meridional circulation is an important ingredient in flux transport dynamo models. We have studied its importance on the period, the amplitude of the solar cycle, and also in producing Maunder-like…
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The Waldmeier effect and the flux transport solar dynamo
We confirm that the evidence for the Waldmeier effect WE1 (the anticorrelation between rise times of sunspot cycles and their strengths) and the related effect WE2 (the correlation between rise rates…
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A dynamo model of magnetic activity in solar-like stars with different rotational velocities
We attempt to provide a quantitative theoretical explanation for the observations that Ca II H/K emission and X-ray emission from solar-like stars increase with decreasing Rossby number (i.e., with…
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Quenching and anisotropy of hydromagnetic turbulent transport
Hydromagnetic turbulence affects the evolution of large-scale magnetic fields through mean-field effects like turbulent diffusion and the $\alpha$ effect. For stronger fields, these effects are…
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Is a deep one-cell meridional circulation essential for the flux transport solar dynamo?
The solar activity cycle is successfully modeled by the flux transport dynamo, in which the meridional circulation of the Sun plays an important role. Most of the kinematic dynamo simulations assume…
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Flux Transport Dynamos: From Kinematics to Dynamics
Over the past several decades, Flux-Transport Dynamo (FTD) models have emerged as a popular paradigm for explaining the cyclic nature of solar magnetic activity. Their defining characteristic is the…
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Turbulent Pumping of Magnetic Flux Reduces Solar Cycle Memory and thus Impacts Predictability of the Sun's Activity
Prediction of the Sun's magnetic activity is important because of its effect on space environment and climate. However, recent efforts to predict the amplitude of the solar cycle have resulted in…
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Global maps of the magnetic field in the solar corona
TLDR
Yang et al. used near-infrared imaging spectroscopy to determine the electron density and magnetohydrodynamic wave speed in the corona and combined these measurements to map the plane-of-sky component of the global coronal magnetic field.
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Correlation Between Decay Rate and Amplitude of Solar Cycles as Revealed from Observations and Dynamo Theory
Using different proxies of solar activity, we have studied the following features of the solar cycle: i) The linear correlation between the amplitude of cycle and its decay rate, ii) the linear…
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