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We point out that there exist two natural definitions of the nucleonmagnetization densities : the density $\rho_M^K (r)$ introduced in Kelly'sphenomenological analysis and theoretically more standard one $\rho_M (r)$. Wecan derive an explicit analytical relation between them, although Kelly'sdensity is more useful to disentangle the physical origin of the different$Q^2$ dependence of the Sachs electric and magnetic form factors of thenucleon. We evaluate both of $\rho_M (r)$ and $\rho_M^K (r)$ as well as thecharge density $\rho_{ch}(r)$ of the proton within the framework of the chiralquark soliton model, to find a noticeable qualitative difference between$\rho_{ch}(r)$ and $\rho_M^K (r)$, which is just consistent with Kelly's resultobtained from the empirical information on the Sachs electric and magnetic formfactors of the proton.

On the physics behind the form factor ratio $\mu_p G_E^p (Q^2) / G_M^p (Q^2)$