Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa11a..04c&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA11A-04
Other
0350 Pressure, Density, And Temperature, 0355 Thermosphere: Composition And Chemistry, 3319 General Circulation (1223), 3367 Theoretical Modeling, 3369 Thermospheric Dynamics (0358)
Scientific paper
Changes in the density and composition of the neutral atmosphere create variable satellite drag, adversely affecting our ability to identify and track objects in space and to predict their re-entry into the atmosphere. Our current ability to predict or understand these density changes is limited. In recent years, models of the coupled thermosphere-ionosphere system have been developed that identify the major contributors to the aeronomy of the upper atmosphere, and offer the potential for space-weather specification and prediction. Very little work has been done to validate the global models with large ionosphere-thermosphere data sets. Some of the uncertainty in the global first-principles models results from difficulty in accurately specifying the inputs. Another difficulty is finding adequate data for a meaningful validation. To investigate the effects of the 27-day solar rotation, we present simulations from the Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model (TIMEGCM), driven by high latitude specifications from the Assimilative Mapping of Ionospheric Electrodynamics (AMIE). Neutral density data from accelerometers on the GRACE mission are used to test our understanding and modeling of the effects of solar EUV forcing on thermospheric densities in the 300 - 500 km region. The Global Ultraviolet Imager (GUVI) on the TIMED satellite also obtains limb profiles of thermospheric density and composition. The GUVI and GRACE data are used to validate the model predictions; in turn, the first-principles model provides insight into the physical processes that drive large thermospheric density changes.
Abusali P.
Bettadpur Srinivas
Cheng Mowei
Christensen A.
Crowley Geoff
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