MELISSA (Measurements of Equatorial and Low-latitude ionospheric Irregularities over Sao Luis, South America) is a 30 MHz coherent backscatter radar interferometer that operated in Sao Luis, Brazil. It was designed, built, and operated as a scientific collaboration between UT Dallas, the Brazilian National Institute for Space Research – INPE and the Jicamarca Radio Observatory.
![](https://labs.utdallas.edu/rodrigues/files/2023/09/melissa-300x225.jpg)
A description of the system and examples of pre- and post-midnight F-region observations are provided in this article: