Development of a Vector Spherical Harmonic (VSH) Model of the Neutral Thermosphere.
MICHIGAN UNIV ANN ARBOR SPACE PHYSICS RESEARCH LAB
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The Air Force has requirements for accurate knowledge and specification of the state variables of the Earths thermosphere. Work done under this contract will lead to a new model of global thermospheric density that can be used to specify and forecast neutral densities, temperatures, and winds for a wide range of solar and geomagnetic activity. The model will be based on simulations made with the National Center for Atmospheric Research NCAR ThermosphereIonosphere General Circulation Model TIGCM and on data. It will be capable of using real-time geophysical indices or data from ground-based and satellite inputs and will provide neutral variables at specified locations and times in the altitude range 90 - 1500 km. This hybrid theoretical and semi- empirical model will be based on a new Vector Spherical Harmonic VSH analysis technique developed at the University of Michigan that permits the incorporation of the TIGCM outputs and data into the model. The VSH model will be provided for use by the Air Force in an operational setting and will be a more accurate version of existing models of the neutral upper atmosphere. This technical report describes the progress in the development of the hybrid model.
- Atmospheric Physics