3 Calculation the distribution

For a given value of the coefficient λ_3T which represents approximately the fraction of suprathermal electrons above the value p_min the normalisation of the distribution function f is calculated with the constraint

(46)

so that

where δ_M and δ_3T are by definition small corrections, i.e. 0 ≤ δ_M ≪ 1 and 0 ≤ δ_3T ≪ 1, provided λ_3T ≪ 1. Indeed, in this case, p_min ≫ p_th^†, while the contribution of the region p ≤p_min to the deviation of the normalisation coefficient is almost negligible. The choice of λ_3T and p_min must be set by the condition

since λ_M ≥ 0.