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The influence of initially given small scale magnetic energy($E_M(0)$) andhelicity($H_M(0)$) on the magnetohydrodynamics(MHD) dynamo was investigated.Equations for $E_M$(t), $H_M$(t), and electromotive force($\langle {\bfv}\times {\bf b}\rangle$, $EMF$) were derived and solved. The solutionsindicate small scale magnetic field(${\bf b}_i$) caused by $E_M$(0) modifies$EMF$ and generates additional terms of which effect depends on magneticdiffusivity $\eta$, position of initial conditions($IC$s) $k_f$, and time($\sim e^{-\eta k_f^2 t}$). ${\bf b}_i$ increases the inverse cascade of energyresulting in the enhanced growth of large scale magnetic field($\overline{{\bfB}}$). Simulation data show that $E_M$(0) in small scale boosts the growthrate, which also proportionally depends on $H_M(0)$. If $E_M$(0) is the same,positive $H_M(0)$ is more effective for MHD dynamo than negative $H_M(0)$ is.It was discussed why large scale magnetic helicity should have the oppositesign of the injected kinetic helicity.

Influence of small scale magnetic energy and helicity on the growth of large scale magnetic field