Nonlinear Breaking Of Ionospheric Gravity Waves Responsive To Tsunamis

In the process of Tsunami long distance transmission,atmospheric gravity waves induced by coherent wave front characteristic.At the same time,atmospheric gravity waves(AGW)in the process of upward communication,including amplitude is exponentially with height,which can be easily observed by GPS in the upper atmosphere.The 2011 Japan tsunami and the 2004 Sumatra tsunami are chosen in the research.And through the full wave model and two-dimensional nonlinear time-independent model for numerical simulation of gravity waves in the ionosphere,in the ionosphere,the broken phenomenon is detected;the phenomenon is shown through the ionospheric electron content(TEC)perturbation.In this paper,the research can be used as detection means of gravity wave propagation in the ionosphere.In this paper,the simulation results show that AGW driven by the 2004 Sumatra tsunami caused the dynamic instability phenomenon in the ionosphere E area.The convectional unstable and broken down are funded in the direction of N250°E.The shear broken down is observed in the direction of N340°E,the perturbation has appeared in about 2200 km from the earthquake's epicenter location in the N250°E direction,after 1h after the earthquake,the location of the ionosphere over more than 700 km from the epicenter appeared convectional instability.In 2011 Japan's tsunami analysis shows that the ocean depth directly affects the gravity wave propagation velocity,is the important factor affecting the ionospheric disturbance,the southeast of the Japan tsunami AGW led to the largest TEC disturbance.Another phenomenon also appears in the simulation results for the Japanese tsunami in northwest,the epicenter of ionospheric disturbance improved remarkably in Japan after about 1h after the tsunami.AGW driven by tsunami generates strong perturbation in the ionosphere,the perturbation gives us an effective way to detect tsunami,and the simulation results show that the 4 h after the tsunami,AGW of the southeast upward can horizontally propagate nearly 4000 km.