The Acoustic Gravity Wave Induced Disturbances in the Equatorial Ionosphere

  • E. Alam KheraniEmail author
  • Mangalathayil Ali Abdu
  • Dave C. Fritts
  • Eurico R. de Paula
Part of the IAGA Special Sopron Book Series book series (IAGA, volume 2)


The role of acoustic gravity waves (AGWs) to excite atmospheric and ionospheric disturbances is examined in this work. These waves are launched in the atmosphere by tropospheric thermal sources and convective activity. An alternative fully time-spatial dependent nonlinear wave equation of acoustic gravity wave is derived and solved numerically using implicit finite-difference scheme. Their propagation in the atmosphere through mesopause thermal duct and lower thermosphere density duct, the role of nonlinear viscous effect to limit the amplitude of these waves in the density duct and to allow them to escape to higher altitude where they attain large amplitude in the bottomside F region Ionosphere, and the role of the mean zonal wind to reduce their amplitude are investigated in present study. To study AGW induced disturbances in the equatorial Ionosphere, the AGW model is coupled with hydromagnetic equations in Ionosphere. This coupling is explored in the context of the collisional interchange instability (CII) in the F region leading to the formation of equatorial F region plasma bubbles. To do so, AGW model is coupled with the CII model and simultaneously solved numerically. The possible role of the AGW to act as a seeding perturbation for equatorial plasma bubbles under varying nature of mean zonal wind and tropospheric thermal source are also investigated.


Gravity Wave Zonal Wind Thermal Source Lower Thermosphere Altitude Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



EAK wish to acknowledge the supports from FAPESP through the process 07/00104-0.


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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • E. Alam Kherani
    • 1
    Email author
  • Mangalathayil Ali Abdu
    • 1
  • Dave C. Fritts
    • 2
  • Eurico R. de Paula
    • 3
  1. 1.National Institute for Space ResearchSão Jose dos CamposBrazil
  2. 2.Colorado Research Associates DivisionNorthWest Research AssociatesBoulderUSA
  3. 3.Instituto Nacional de Pesquisas Espaciais (INPE)São Jose dos CamposBrasil

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