Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa11a..03f&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA11A-03
Physics
0350 Pressure, Density, And Temperature, 2427 Ionosphere/Atmosphere Interactions (0335), 3369 Thermospheric Dynamics (0358), 3389 Tides And Planetary Waves, 7969 Satellite Drag (1241)
Scientific paper
Thermospheric variability arises from both externally driven and internally generated physical processes. The external forcing arises from solar EUV, geomagnetic activity, and wave disturbances from the lower atmosphere. Understanding the partitioning of thermospheric density variability between these three main sources remains a critical need. Internally, the variability can arise from the coupling between the plasma and neutral gas, and from internal dynamics. For instance, energy deposited by plasma recombination at the latitude of the equatorial ionization anomaly give rise to neutral density maxima that change from day-to-day. In addition, the seasonal circulation from summer to winter introduces a semi-annual variation (SAV). The magnitude of the SAV depends on the strength of the interhemispheric solar forcing but the cause of the phase modulated has yet to be determined. A review of the various internal processes and the response to external forcing reveals the outstanding challenges in our understanding of the physical system.
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