Abstract

Space-borne observations of thermospheric temperature, wind, and airglow measurements, as well as ionosphereric density and drift diagnostics exhibit notable longitudinal variations during geomagnetically quiescent conditions. Many of these variations can been attributed to non-migrating tides of... Show moreSpace-borne observations of thermospheric temperature, wind, and airglow measurements, as well as ionosphereric density and drift diagnostics exhibit notable longitudinal variations during geomagnetically quiescent conditions. Many of these variations can been attributed to non-migrating tides of tropospheric origin and have been successfully replicated by the National Center for Atmospheric Research (NCAR) thermosphere-ionosphere-mesosphere-electrodynamics general circulation model (TIME-GCM) when it includes Global-Scale Wave Model (GSWM-02) forcing at the lower boundary (ca. 30 km). However, these TIME-GCM/GSWM-02 results do not capture the observed seasonal variability of the non-migrating tides. Recently, Zhang et al. (2009a,b) developed new tropospheric tidal forcing based upon International Satellite Cloud Climatology Project (ISCCP) and Tropical Rainfall Measuring Mission (TRMM) observations and reported updated GSWM-09 nonmigrating tidal climatologies. Herein, we present signatures of nonmigrating tides from a new set of TIME-GCM/GSWM-09 simulations and assess whether this updated model is better able to capture the observed seasonal variations of these tides in the thermosphere and ionosphere during solar minimum conditions. Show less