Thermospheric longitudinal structures simulated by the Whole Atmosphere Model (WAM)

Details Thermospheric longitudinal structures simulated by the Whole Atmosphere Model (WAM) Thermospheric longitudinal structures simulated by the Whole Atmosphere Model (WAM)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31a1710a&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31A-1710

Other

[0350] Atmospheric Composition And Structure / Pressure, Density, And Temperature, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [3369] Atmospheric Processes / Thermospheric Dynamics, [3389] Atmospheric Processes / Tides And Planetary Waves

Scientific paper

The now well known four-peak structure in the daytime equatorial ionosphere has previously been associated with the nonmigrating diurnal eastward propagating tide with zonal wavenumber 3 (DE3) primarily generated by the land-sea distribution and associated orography and convection in the tropics. The ionospheric vertical drift and electron densities are believed to be affected by lower atmosphere tides through the dynamo mechanism in the lower thermosphere. Similar longitudinal variations have also been observed in neutral mass density and temperature at fixed local time. These features appear to be the result of direct penetration of tidal waves to satellite altitudes. Preliminary analysis of long-term simulations with the Whole Atmosphere Model (WAM) for different levels of solar activity reveals the presence of discernable nonmigrating signatures in the neutral upper thermosphere. In particular, substantial contributions from other nonmigrating tides, such as the semidiurnal eastward zonal wavenumber 2 (SE2) wave, are evident.

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