 The faculae are located on the edge of a ridge on the anti-Jupiter side of Amalthea.Due to tidal force from Jupiter and Amalthea's low density and irregular shape, the escape velocity at its surface points closest to and furthest from Jupiter is no more than 1 m/s and dust can easily escape from it after, e.g.micrometeorite impacts; this dust forms the Amalthea Gossamer Ring.