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We perform 2.5D particle-in-cell simulations of decaying turbulence in thepresence of a guide (out-of-plane) background magnetic field. The fluctuatingmagnetic field initially consists of Fourier modes at low wavenumbers (longwavelengths). With time, the electromagnetic energy is converted to plasmakinetic energy (bulk flow+thermal energy) at the rate per unit volume of ${\ppJ}\cdot{\pp E}$ for current density ${\pp J}$ and electric field ${\pp E}$.Such decaying turbulence is well known to evolve toward a state with stronglyintermittent plasma current. Here we decompose the electric field intocomponents that are irrotational, ${\pp E}_{\rm ir}$, and solenoidal(divergence-free), ${\pp E}_{\rm so}$. ${\pp E}_{\rm ir}$ is associated withcharge separation, and ${\pp J}\cdot{\pp E}_{\rm ir}$ is a rate of energytransfer between ions and electrons with little net change in plasma kineticenergy. Therefore, the net rate of conversion of electromagnetic energy toplasma kinetic energy is strongly dominated by ${\pp J}\cdot{\pp E}_{\rm so}$,and for a strong guide magnetic field, this mainly involves the component ${\ppE}_{\rm so,\parallel}$ parallel to the total magnetic field ${\pp B}$. Weexamine various indicators of the spatial distribution of the energy transferrate {\bf J$_\parallel\cdot$E$_{so,\parallel}$}, which relates to magneticreconnection, the best of which are 1) the ratio of the out-of-plane electricfield to the in-plane magnetic field, 2) the out-of-plane component of thenon-ideal electric field, and 3) the magnitude of the estimate of currenthelicity.

Role of Parallel Solenoidal Electric Field on Energy Conversion in 2.5D Decaying Turbulence with a Guide Magnetic Field