  The Dagum family of isotropic covariance functions has two parameters that
allow for decoupling of the fractal dimension and Hurst effect for Gaussian
random fields that are stationary and isotropic over Euclidean spaces.
Sufficient conditions that allow for positive definiteness in Rd of the Dagum
family have been proposed on the basis of the fact that the Dagum family allows
for complete monotonicity under some parameter restrictions. The spectral
properties of the Dagum family have been inspected to a very limited extent
only, and this paper gives insight into this direction. Specifically, we study
finite and asymptotic properties of the isotropic spectral density (intended as
the Hankel transform) of the Dagum model. Also, we establish some closed forms
expressions for the Dagum spectral density in terms of the Fox{Wright
functions. Finally, we provide asymptotic properties for such a class of
spectral densities.
