Improved Modeling of Thermospheric Density Perturbations With Application to Satellite Ephemeris Prediction

Details Improved Modeling of Thermospheric Density Perturbations With Application to Satellite Ephemeris Prediction Improved Modeling of Thermospheric Density Perturbations With Application to Satellite Ephemeris Prediction

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa31a..12r&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA31A-12

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3369 Thermospheric Dynamics (0358)

Scientific paper

Precise ephemeris determination and prediction is in high demand for applications in precise tracking, satellite lifetime estimation, debris analysis, attitude control, collision avoidance, and reentry. In low Earth orbit, orbit prediction accuracy is driven primarily by the ability to accurately approximate atmospheric drag effects on satellite motion. Drag modeling errors result primarily from an inability to accurately predict and model upper atmospheric density variations in response to fluctuations in geomagnetic and solar activity. In this work, methodologies are presented for improving the geomagnetic and solar activity density formulation in the Jacchia 1970 (J70) model currently in operational use at USSPACECOM. The functional form of the exospheric temperature in J70 is modified to better represent density variations derived from Satellite Electrostatic Triaxial Accelerometer (SETA) data at 200 km. Model corrections are then evaluated and compared to the operational J70 model through a series of orbit prediction studies, especially during critical periods when solar activity and semiannual changes are large, or combine together to strongly modify the drag environment.

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