2025/07/31 by Lima, J. A. S., Benetti, M. H.
#FOS: Physical sciences #Plasma Physics (physics.plasm-ph)
paper · doi:10.48550/arxiv.2508.00114
An extension of Maxwell's original prescription for an ideal gas is adopted to derive a broad class of Kappa-type velocity distributions, encompassing both fat and short-tailed forms. Within this general framework, a physically consistent fat-tailed Kappa distribution is identified that accurately fits recent suprathermal data. In particular, a kinetic physical temperature T emerges naturally from the model, eliminating the need to invoke an effective temperature Tκℓ, as is commonly done in the literature. Finally, it is argued that only a particular value of ℓ ensures a satisfactory fit to the data when the physical kinetic temperature is employed.