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Coupling Processes in the Equatorial Spread F/Plasma Bubble Irregularity Development

  • Mangalathayil Ali AbduEmail author
  • E. Alam Kherani
Chapter
Part of the IAGA Special Sopron Book Series book series (IAGA, volume 2)

Abstract

The plasma convection pattern of the evening sector equatorial ionosphere sets the condition for the plasma structuring through instability processes leading to the Equatorial Spread F (ESF)/plasma bubble irregularity development and evolution. Vertical coupling through upward propagating atmospheric waves controls/modifies the ionosphere-thermosphere interactive processes that eventually lead to the irregularity development. Instabilities grow by the Rayleigh-Taylor mechanism at the bottom side gradient region of a “rapidly” rising post sunset F layer in the presence of precursor conditions in terms of perturbations in plasma density, convection velocity and polarization electric fields. Field line integrated conductivity controlled by thermospheric meridional/trans-equatorial winds regulates the instability growth. The day-to-day and short term variabilities in the ESF are of major concern for space application and operational systems. Our efforts to understand such variabilities and to predict the ESF occurrence pose important scientific challenges especially because of the complexity of the diverse coupling processes that control them. There is convincing new evidences that during magnetically quiet conditions, the coupling processes due to upward propagating planetary waves and/or modulated tides, and gravity waves, with their highly variable propagation conditions, energy fluxes and periodicities control the ESF variability. Penetrating electric fields and disturbance dynamo electric fields from magnetosphere-ionosphere coupling processes also cause large degree of variability. This chapter provides a review of our current understanding of the ESF development processes and its day-to-day variability originating from the different coupling processes mentioned above.

Keywords

Flux Tube Vertical Drift Polarization Electric Field Equatorial Ionization Anomaly Bubble Rise Velocity 
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.

Notes

Acknowledgements

MAA wishes to acknowledge the supports received from the CNPq (Conselho Nacional de Pesquisa e Desenvolvimento) through the grant: 300883/2008-00. EAK wish to acknowledge the support from FAPESP through the grant 07/00104-0.

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© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.National Institute for Space ResearchSão Jose dos CamposBrazil

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