  Context. Findings by the Helios and STEREO mission have indicated the
presence of a resonant circumsolar ring of dust associated with Venus. Attempts
to model this phenomenon as an analogue to the resonant ring of Earth - as a
result of migrating dust trapped in external mean-motion resonances (MMRs) -
have so far been unable to reproduce the observed dust feature. Other theories
of origin have recently been put forward. However, the reason for the low
trapping efficiency of Venus's external MMRs remains unclear. Aims. Here we
look into the nature of the dust trapping resonant phenomena that arise from
the multi-planet configuration of the inner Solar System, aiming to add to the
existent understanding of resonant dust rings in single planet systems.
Methods. We numerically modelled resonant dust features associated with the
inner planets and specifically looked into the dependency of these structures
and the trapping efficiency of particular resonances on the configuration of
planets. Results. Besides Mercury showing no resonant interaction with the
migrating dust cloud, we find Venus, Earth, and Mars to considerably interfere
with each other's resonances, influencing their ability to form circumsolar
rings. We find that the single most important reason for the weakness of
Venus's external MMR ring is the perturbing influence of its outer neighbour -
Earth. In addition, we find Mercury and Mars to produce crescent-shaped density
features, caused by a directed apsidal precession occurring in particles
traversing their orbital region.
