Accurate models of the density, composition, and temperature of the Earth's atmosphere, from ground through to exobase, are indispensible for satellite operations, remote sensing imagery analysis, and as source terms in modelling software that propagate light through the atmosphere. The JB2008 (Jacchia-Bowman) model is a newer model developed by Space Environment Technologies and the US Air Force Space Command. The model accounts for various phenomena related to EUV heating of the thermosphere and uses the DST index as the driver of global density changes. The model is complementary to the NRLMSISE00 model and is more accurate during times of high solar activity and geomagnetic storms. It is recommended by COSPAR as the standard for thermospheric density in satellite drag calculations.