  The accelerations of tracer and light particles in compressible homogeneous
isotropic turbulence (CHIT) is investigated by using data from direct numerical
simulations (DNS) up to turbulent Mach number $M_t =1$. For tracer particles,
the flatness factor of acceleration components, $F_a$, increases gradually for
$M_t \in [0.3, 1]$. On the contrary, $F_a$ for light particles develops a
maximum around $M_t \sim 0.6$. The PDF of longitudinal acceleration of tracers
is increasingly skewed towards the negative value as $M_t$ increases. By
contrast, for light particles, the skewness factor of longitudinal
acceleration, $S_a$, firstly becomes more negative with the increase of $M_t$,
and then goes back to $0$ when $M_t$ is larger than $0.6$. Similarly,
differences among tracers and light particles appear also in the zero-crossing
time of acceleration correlation. It is argued that all these phenomenons are
intimately linked to the flow structures in compression regions, e.g. close to
shocklets.
