  In this paper, we investigate some geometric functionals for band limited
Gaussian and isotropic spherical random fields in dimension 2. In particular,
we focus on the area of excursion sets, providing its behavior in the high
energy limit. Our result is based on Wiener chaos expansion for non linear
transform of Gaussian fields and on an explicit derivation on the
high-frequency limit of the covariance function of the field. As a simple
corollary we establish also the Central Limit Theorem for the excursion area.
