Affiliation of Author(s):航天学院
Journal:JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Key Words:tsunami atmospheric gravity waves traveling ionospheric disturbances total electron content numerical simulation ionospheric response
Abstract:Ionospheric fluctuations inferred from observations of total electron content have previously been attributed to tsunamis and have confirmed the strong coupling between Earth's ocean and ionosphere via atmospheric gravity waves (AGWs). To further advance our understanding of this wave coupling process we employ a linear full-wave model and a nonlinear time-dependent model to examine the ionospheric response to the AGW perturbations induced by the 2004 Sumatra and the 2011 Tohoku tsunamis. In the 2004 case, our modeling analyses reveal that one component of the propagating AGWs becomes dynamically unstable in the E-region ionosphere at a range exceeding 2000 km in a direction 340 degrees clockwise from north. Another component becomes convectively unstable in the E-region ionosphere at a range exceeding 700 km in a direction 250 degrees clockwise from north. In the 2011 case, a significant enhancement in the ionospheric disturbance occurs in a direction northwest from the epicenter about 1h following the tsunami onset, in general agreement with observations. Our simulations also indicate that the AGW propagating toward the southeast is responsible for a traveling ionospheric disturbance that remains of an observable amplitude for over 4h during which time it propagates horizontally almost 4000 km.
ISSN No.:2169-9380
Translation or Not:no
Date of Publication:2017-01-01
Co-author:Wang, Wenqing,Hickey, Michael P.
Correspondence Author:yyh