The Jacchia-Bowman 2008 Empirical Thermospheric Density Model
JB2008 is based on Jacchia’s diffusion equations. Driving solar indices are computed from space-based sensor data, which provide the solar irradiances in the extreme through far ultraviolet, including x-ray and Lyman-α wavelengths. Exospheric temperature equations represent the thermospheric EUV and FUV heating. Semiannual density equations based on multiple 81-day average solar indices represent the variations in the semiannual density cycle that result from EUV heating. Geomagnetic storm effects are modeled using the Dst index as the driver of global density changes. Extensive model validation was performed by Bowman et al. , which includes comparisons with accurate daily density drag data previously computed for numerous satellites in the altitude range of 175 to 1000 km, model comparisons between JB2008, JB2006, Jacchia 1970, and NRLMSIS-00 models, and comparisons to accelerometer measurements from the CHAMP and GRACE satellites.
Indices and Code Access
The JB2008 empirical thermospheric density model code is provided, as well as historical space weather indices with a 45-day lag.
Access JB2008 model code and historical indices
SET offers current epoch and forecast operational indices to the community through the Unified Data Library (UDL). Whether for research or operational use, please visit the Unified Data Library site to request a subscription.
Publications, License, and Acknowledgement