The new empirical thermospheric density model, Jacchia-Bowman 2008, is developed as an improved revision to the Jacchia-Bowman 2006 model, which is based on the CIRA72 (COSPAR International Reference Atmosphere 1972) model. The CIRA72 model integrates the diffusion equations using the Jacchia 71 temperature formulation to compute density values for an input geographical location and solar conditions. New Driving solar indices are computed from on-orbit sensor data, which are used for the solar irradiances in the extreme through far ultraviolet, including X-ray and Lyman-? wavelengths. New exospheric temperature equations are developed to represent the thermospheric EUV and FUV heating. New semiannual density equations based on multiple 81-day average solar indices are used to 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.
JB2008 requires solar inputs [F10.7, S10.7 (EUV), M10.7 (FUV), Y10.7 (X-ray and Lyman-α) indices, the centered 81-day average of the four indices] and geomagnetic inputs [Ap and Dst indices]
JB2008 produces exospheric temperature, neutral temperature, and total mass density.
Model is time-dependant.
Space Weather Impacts
- Atmosphere variability (satellite/debris drag)
- Atmosphere Expansion
- Marcos, F.A., "Accuracy of Atmospheric Drag Models at Low Satellite Altitudes," Advances in Space Research, 10, p. 417, 1990.
- Bowman, B.R., "The Semiannual Thermospheric Density Variation From 1970 to 2002 Between 200-1100km," AAS 2004-174, AAS/AIAA Spaceflight Mechanics Meeting, Maui, HI, February, 2004.
- Bowman, B.R., et al., "A Method for Computing Accurate Daily Atmospheric Density Values from Satellite Drag Data," AAS 2004-179, AAS/AIAA Spaceflight Mechanics Meeting, Maui, HI, Feb, 2004.
- COSPAR International Reference Atmosphere 1972, Compiled by the members of COSPAR Working Group 4, Akademie-Verlag, Berlin, Germany, 1972.
- Jacchia, L.G., "Revised Static Models of the Thermosphere and Exosphere with Empirical Temperature Profiles", Smithson. Astrophys. Special Report 332, 1971.
- Bowman, B.R., et al., "Improvements in Modeling Thermospheric Densities Using New EUV and FUV Solar Indices," AAS 2006-237, AAS/AIAA Spaceflight Mechanics Meeting, Tampa, FL, January, 2006
- Bowman, B. R., "True Satellite Ballistic Coefficient Determination for HASDM," AIAA-2002-4887, AIAA/AAS Astrodynamics Specialist Conference, Monterey, CA, August, 2002.
- Bowman, B.R., et al., "A New Empirical Thermospheric Density Model JB2006 Using New Solar Indices," AIAA 2006-6166, AIAA/AAS Astrodynamics Specialist Conference, Keystone, CO, August, 2006.
- Bowman, B.R., et al., "The Thermospheric Semiannual Density Response to Solar EUV Heating," Journal of Atmospheric and Solar-Terrestrial Physics, doi:10.1016/j.jastp.2008.04.020, 2008
- Bowman, B.R., et al., "A New Empirical Thermospheric Density Model JB2008 Using New Solar And Geomagnetic Indices," AIAA 2008-6438, AIAA/AAS Astrodynamics Specialist Conference, Honolulu, HI, August, 2008.
Code Languages: Fortran
- Bruce R Bowman, Air Force Space Command (Model Contact)
- Jia Yue, NASA/GSFC (CCMC Model Host)
- Katherine Garcia-Sage, NASA/GSFC (CCMC Model Host)
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