Tidal Signatures in the upper Atmosphere from the Equator to the Pole Chao Xiong 1, Hermann Lühr 1, Claudia Stolle 1, and Jorge Chau 2 1. Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany. 2. Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany. DFG-SPP “1788 DynamicEarth” GFZ Potsdam, July, 2014
WN4 and WN3 as well as Midlatitude Summer Night Anomaly (MSNA) Equatorial region ? Northern hemi Southern hemi Weddell Sea Anomaly (WSA), first observed by an ionosode in the 1950s (Bellchambers and Piggott, 1958; Penndorf, 1965). Midlatitude Summer Night Anomaly (MSNA) observed by satellites observations (Lin et al., 2009; Thampi et al., 2010; Liu et al., 209). (Liu et al., 2010) (Lühr and Manoj., 2013) Equatorial Electrojet Electron density
Wave-1 and Wave-2 patterns of MSNA in the two hemispheres (Xiong and Lühr., 2014) Electron density Thermospheric mass density CHAMP -40°~-60° MLAT GRACE 40°~60° MLAT
Swarm Observations during solstice seasons Swarm-ASwarm-BSwarm-C Swarm-ASwarm-BSwarm-C Dec. S Southern hemisphere June. S Northern hemisphere
The opportunity Swarm provides us Pole Equator Ionosphere-Thermosphere (IT) Lower Atmosphere Mesopause 0 km 500 km Tides Atmosphere-Ionosphere Coupling by Tides & Planetary Waves plasma flow tidal penetra tion B E tidal dynam o tidal dissipation O3H2OO3H2O Tides Atmosphere-Space Interaction Region PWs E equator ial anomal y compositio n changes wind transpo rt The primary mechanism through which energy and momentum are transferred from the lower atmosphere to the upper atmosphere and ionosphere is through the generation and propagation of waves (Forbes et al., 2014). The Swarm constellation provides us good opportunity for better understanding the Atmosphere- Ionosphere (AI) coupling mechanisms at different latitude regions: 1. Analyzing the tidal signatures of ionospheric and thermosperic quantities. 2. Compare the tidal signatures at different altitudes. 3. Compare the Swarm in situ observations with groundbased measuremtns, to separate the different sources of the tides.