51 citations · 232 across the 7 of their papers we have counts for
7 papers
Production of sunspots and their effects on the corona and solar wind: Insights from a new 3D flux-transport dynamo model
Rohit Kumar, Laurène Jouve, Rui F. Pinto +1
We present a three-dimensional numerical model for the generation and evolution of the magnetic field in the solar convection zone, in which sunspots are produced and contribute to…
Dynamo transition in a five-mode helical model
Rohit Kumar, Pankaj Wahi
We construct a five-mode helical dynamo model containing three velocity and two magnetic modes and solve it analytically. This model exhibits dynamo transition via supercritical pi…
Amplification of large-scale magnetic field in nonhelical magnetohydrodynamics
Rohit Kumar, Mahendra K. Verma
It is typically assumed that the kinetic and magnetic helicities play a crucial role in the growth of large-scale dynamo. In this paper we demonstrate that helicity is not essentia…
Dynamos at extreme magnetic Prandtl numbers: Insights from shell models
Mahendra K. Verma, Rohit Kumar
We present an MHD shell model suitable for computation of various energy fluxes of magnetohydrodynamic turbulence for very small and very large magnetic Prandtl numbers $\mathrm{Pm…
Energy transfers in dynamos with small magnetic Prandtl numbers
Rohit Kumar, Mahendra K. Verma, Ravi Samtaney
We perform numerical simulation of dynamo with magnetic Prandtl number on grid, and compute the energy fluxes and the shell-to-shell energy transfers. T…
Energy transfers and magnetic energy growth in small-scale dynamo
Rohit Kumar, Mahendra K. Verma, Ravi Samtaney
In this letter we investigate the dynamics of magnetic energy growth in small-scale dynamo by studying energy transfers, mainly energy fluxes and shell-to-shell energy transfers. W…