  We present a statistical analysis on the variability of the incompressible
energy cascade rate in the solar wind around Mars, making use of an exact
relation for fully developed turbulence and more than five years of Mars
Atmosphere and Volatile EvolutioN (MAVEN) observations. Using magnetic field
and plasma data, we compute the energy cascade rate in the magnetohydrodynamics
(MHD) scales in the pristine solar wind. From our statistical results, we
conclude that the incompressible energy cascade rate decreases as the Martian
heliocentric distance increases, for each of the three explored Martian years.
Moreover, we show that the presence of proton cyclotron waves, associated with
the extended Martian hydrogen exosphere, do not have a significant effect in
the nonlinear cascade of energy at the MHD scales.
