Parameter dependence of transport-prefactor deviations

Determine how the prefactor shifts in the simulated electron--ion collision frequency and perpendicular diffusion coefficient evolve across broader plasma conditions, including higher-temperature, lower-density, lower-temperature, higher-density, and differently magnetized regimes, and establish whether higher-temperature or lower-density plasmas approach weak-coupling classical behavior more closely.

Background

The paper benchmarks direct Debye-screened many-body Newton--Lorentz simulations against classical reduced transport theory. In the studied ionosphere-like parameter range, the simulated momentum-relaxation rate and cross-field diffusion coefficient preserve the classical scalings but have lower prefactors than the corresponding classical estimates. The authors emphasize that these discrepancies are regime-specific rather than universal correction factors.

The authors explicitly state that broader parameter scans are required to determine how these prefactor deviations change. They identify higher-temperature or lower-density plasmas as regimes that might more closely approach weak-coupling classical behavior, while noting that lower-temperature, higher-density, or differently magnetized conditions might instead enlarge the deviations or qualitatively change transport.