Animation of the A-train including the Glory satellite.
The name "A-Train" comes from the formation of international, Earth-observing satellites known as the Afternoon Constellation, which operate in a Sun-synchronous orbit at an altitude of 705 km. The close proximity of the different spacecraft within the A-Train allows for coincident observations between instruments on different spacecrafts, providing scientists additional capabilities in their pursuit of answers about the Earth and its climate. Upon joining the A-train, Glory will help researchers better understand two critical forcings of Earth's climate: atmospheric aerosols and total solar irradiance.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 184.108.40.206.0