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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 36, issue 1 | Copyright

Special issue: Space weather connections to near-Earth space and the...

Ann. Geophys., 36, 25-35, 2018
https://doi.org/10.5194/angeo-36-25-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 10 Jan 2018

Regular paper | 10 Jan 2018

Simulating the dependence of seismo-ionospheric coupling on the magnetic field inclination

Lalit Mohan Joshi1, Samireddipelle Sripathi1, Muppidi Ravi Kumar1, and Esfhan Alam Kherani1,2 Lalit Mohan Joshi et al.
  • 1Indian Institute of Geomagnetism, Navi Mumbai, 410218, India
  • 2National Institute for Space Research, São José dos Campos, Brazil

Abstract. Infrasound generated during a seismic event upon reaching the ionospheric heights possesses the ability to perturb the ionosphere. Detailed modelling investigation considering 1-D dissipative linear dynamics, however, indicates that the magnitude of ionospheric perturbation strongly depends on the magnetic field inclination. Physics-based SAMI2 model codes have been utilized to simulate the ionosphere perturbations that are generated due to the action of the vertical wind perturbations associated with the seismic infrasound. The propagation of the seismic energy and the vertical wind perturbations associated with the infrasound in the model has been considered to be symmetric about the epicentre in the north–south directions. Ionospheric response to the infrasound wind, however, has been highly asymmetric in the model simulation in the north–south directions. This strong asymmetry is related to the variation in the inclination of the Earth's magnetic field north and south of the epicentre. Ionospheric monitoring generally provides an efficient tool to infer the crustal propagation of the seismic energy. However, the results presented in this paper indicate that the mapping between the crustal process and the ionospheric response is not a linear one. These results also imply that the lithospheric behaviour during a seismic event over a wide zone in low latitudes can be estimated through ionospheric imaging only after factoring in the magnetic field geometry.

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Short summary
This work deals with the theoretical investigation of the inherent north&endash;south asymmetry in the ionospheric response to seismic infrasound. Magnetic field parallel component of the wind vector associated with the seismic infrasound varies significantly in the north–south direction due to the variation in the inclination of the Earth's magnetic field. This and other related aspects have been investigate using the physics-based ionospheric model.
This work deals with the theoretical investigation of the inherent north&endash;south asymmetry in the...
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