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Poisson-continuity coupled equation

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Hello,
I try to model the corona discharge in wire-cylinder geometry governed by the equations:

nabla (V) =- rho/epsilon0 (Poisson equation) and

grad (rho) * grad (V) = rho ^ 2/epsilon0 (equation of current continuity)

with boundary conditions:
V_w = V0 (on the wire)
V_cyl = 0 (on the cylinder)

As rho is unknown, I should compile until the electric field on the wire is equal to a given value Es.

knowing that I can give an initial estimate for rho on the wire --> rho_w.

My problem is I dont know how to solve these two coupled equations.

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