Abstract
AbstractTsunami‐induced airglow emission perturbations were retrieved by using space‐based measurements made by the Sounding of the Atmosphere using Broad‐band Emission Radiometry (SABER) instrument on board the Thermosphere‐Ionosphere‐Mesosphere Energetics Dynamics spacecraft. At and after the time of the Tohoku‐Oki earthquake on 11 March 2011, and the Chile earthquake on 16 September 2015, the spacecraft was performing scans over the Pacific Ocean. Significant (~10% relative to the ambient emission profiles) and coherent nighttime airglow perturbations were observed in the mesosphere following Sounding of the Atmosphere using Broad‐band Emission Radiometry limb scans intercepting tsunami‐induced atmospheric gravity waves. Simulations of emission variations are consistent with the physical characteristics of the disturbances at the locations of the corresponding SABER scans. Airglow observations and model simulations suggest that atmospheric neutral density and temperature perturbations can lead to the observed amplitude variations and multipeak structures in the emission profiles. This is the first time that airglow emission rate perturbations associated with tsunamis have been detected with space‐based measurements.
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