Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) is a program designed to provide advances in meteorology, ionospheric research, climatology, and space weather by using GPS satellites in conjunction with low Earth orbiting (LEO) satellites.

The constellation is a joint U.S.-Taiwanese project with major participants including the University Corporation for Atmospheric Research (UCAR), the National Science Foundation, the Naval Research Laboratory (NRL), the Air Force Research Laboratory (AFRL), SRI International on the U.S. side and the National Space Organization (NSPO) on the Taiwanese side.

[2] The satellites, which orbit at an altitude of 500 miles, required over a year to move into the correct positions to provide full global coverage.

FM2's power system lost 50% of its output in February 2007, while FM3's solar panel also malfunctioned since August 2007.

As a result, both satellites are operating in a degraded state, capable of returning data only during specific solar angles.