ICON Working Group Meeting, Boulder, CO, October 28, 2015., 2015 (Presentation)
R. Niciejewski , Wu, Q.
Abstract:
| Using TIDM-IGGCAS-II model and tidal winds from TIMED/TIDI observations, we also simulated the influence of the lower thermospheric tidal winds on the equinoctial asymmetry of V. The simulated equinoctial asymmetry in V are mainly driven by DW1, SW2, DE3, and DW2 tides. The asymmetry in daytime V varies with local time and longitude and mainly shows three features. First, the simulated daytime V during the March equinox is larger than that during the September equinox in most of longitudinal sectors. Second, the daytime V asymmetry in the Eastern Hemisphere is more significant than that in the Western Hemisphere. Our simulation suggests that the longitudinal variations of the geomagnetic fields and DW2 tides play important roles in the generation of this hemisphere difference. Third, there is an obvious wave number 4 longitudinal structure in the V asymmetry driven by the equinoctial asymmetry of the DE3 tide. |