Long-term evolution of the aerosol debris cloud produced by the 2009 impact on Jupiter

► We study the evolution of the 19 July 2009 impact cloud in Jupiter at 58°S latitude. ► The impact cloud expanded zonally from ∼ 5000 km to 225,000 km in 3.5 months. ► Expansion was due to the zonal winds and their meridional and vertical shears. ► Nonlinear simulations with EPIC code indicates low vertical wind shears at the impact latitudes. ► The cloud reflectivity decreased in time exponentially with a characteristic scale of 15 days.