Global-scale Observations of Limb and Disk (GOLD) disk measurements of; far ultraviolet molecular nitrogen band emissions are used to retrieve; column integrated disk temperatures (T$_{disk}$), which are; representative of the lower-and-middle thermosphere. The present work; develops a new approach to assimilate the T$_{disk}$ in the Whole; Atmosphere Community Climate Model with thermosphere-ionosphere; eXtension (WACCMX) using the Data Assimilation Research Testbed (DART); ensemble adjustment Kalman filter. A total of 9 days of data during 1 to; 9 November 2018 are assimilated. Analysis state variables such as; thermospheric effective temperature (T$_{eff}$), ratio of atomic; oxygen to molecular nitrogen column densities (O/N$_2$), and column; electron content are compared with a control simulation that is only; constrained up to $sim$50 km. It is observed that; assimilation of the GOLD T$_{disk}$ improves the analysis states; when compared with the control simulation. The analysis states,; particularly, T$_{eff}$, O/N$_2$, and column electron contents; are also compared with their measurement counterparts for the validation; of the assimilation. T$_{eff}$ and O/N$_2$ are compared with; GOLD T$_{disk}$ and O/N$_2$. While, the Electron Column Density; (ECD) from the analyses is compared with ground based Total Electron; Content (TEC) measurements from Global Navigational Satellite System; (GNSS) receivers. Root Mean Square Error (RMSE) improvements in; T$_{eff}$ and O/N$_2$ are about 12.8% and 13.2%, respectively.; The RMSE improvement in analyses ECD is about 8% compared to control; simulation.
