abstract:The Coquí and Coquí 2 (Coquí Dos) campaign involved a sequence of sounding rocket launches in order to study the dynamics of the E- and F-region ionosphere and increase our understanding of layering phenomena, such as sporadic E layers. The studies were supported by the United States' National Aeronautics and Space Administration (NASA) and carried out in 1992 and 1998 respectively.