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The idea of the meson cloud approach in the chiral quark model has beenextended to include gluon cloud in order to achieve the parton densities in thenucleon, based on the constitute quark framework. The splitting function of thequark to the quark-meson and quark-gluon at low $Q^2$ value are used to obtainparton densities in the constituent quark. The phenomenological constituentmodel is employed to extract the parton distributions in the proton at low$Q^2$ value. Since we have access to the parton densities at low $Q^2$, we areable to obtain $F_{2}(x,Q^2)$ structure function at low $Q^2$ value. The resultis in good agreement with available experimental data and some theoreticalmodels. To confirm the validity of our calculations, the fraction of totalmomentum of proton which is carried by gluon at high $Q^2$ and also theGottfried sum rule are computed. The results are in good agreement with whatare expected.

Low $Q^2$ proton structure function, using gluon and pseudoscalar meson clouds in the constituent quark framework