During Cluster spacecraft crossing of the magnetotail. a novel density depleted cavity in association with magnetic compressions in the outflow region of reconnection was observed. It contains intense reflected field-aligned particles. which are produced by a generation mechanism similar to that of the terrestrial foreshock. https://www.roneverhart.com/1915-Old-Taylor-Bourbon-Bottled-1933-Prohibition-Bottling-Quart-low-fill/