Large-scale Control of Kinetic Dissipation in the Solar Wind

摘要: In this Letter we study the connection between large-scale dynamics of turbulence cascade and particle heating on kinetic scales. We find that inertial range amplitude ($\delta B_i$; measured in 0.01-0.1 Hz) is a simple effective proxy to identify onset significant ion when it combined with $\beta_{||p}$, characterizes energy partitioning protons electrons ($T_p/T_e$), proton temperature anisotropy ($T_{\perp}/T_{||}$) scalar ($T_p$) way consistent previous predictions. For fixed $\delta B_i$, ratio linear nonlinear timescales strongly correlated agreement Matthaeus et al., though for solar wind intervals $\beta_{||p}>1$ some discrepancies are found. an increase leads higher $T_p/T_e$ ratios, which models Chandran al. Wu discuss implications these findings our understanding plasma turbulence.