  We carried out wind tunnel experiments on parabolic flights with 100 $\mu$m
Mojave Mars simulant sand. The experiments result in shear stress thresholds
and erosion rates for varying g-levels at 600 Pa pressure. Our data confirm
former results on JSC Mars 1A simulant where the threshold shear stress is
lower under Martian gravity than extrapolated from earlier ground-based studies
which fits observations of Martian sand activity. The data are consistent with
a model by Shao and Lu (2000) and can also be applied to other small
terrestrial (exo)-planets with low pressure atmospheres.
