Connors, Martin - The Temporal Variation of the Rate of Interplanetary Field enhancements seen in Association with Asteroids 2201 Oljato at Venus and 138175 at Earth: Evidence for Co-orbital Material Disturbed by Gravitational Interactions

Abstract: 
We have modeled the orbital evolution of material liberated from both 2201 Oljato and asteroid 138175 in an attempt to understand the temporal changes associated with IFEs.  These IFEs are seen when the asteroidal orbits are inside the orbit of the detecting satellite and the observation is close to the ascending and descending nodes so that collisions with the co-orbiting debris could cause detectable charged dust clouds carried outward by the solar wind across our satellites in the ecliptic plane.  These simulations show that the co-orbiting debris trail is disrupted by passages near the Earth and Venus.  Gaps induced in the trail can result in seeming temporal changes as it is sampled at varying places relative to the source body. On a longer time scale, the debris spreads along the orbit and is mainly detected surrounding one or both of the body’s nodes after inferred secondary collisions. The gap production mechanism is operative for a large range of ejection speeds, and is absent in a control case without close encounters.