Instabilities in the Midlatitude Ionosphere in Terms of E–F Coupling

  • Tatsuhiro YokoyamaEmail author
Part of the IAGA Special Sopron Book Series book series (IAGA, volume 2)


There are two intriguing phenomena in the midlatitude ionosphere: quasi-periodic (QP) radar echoes associated with a sporadic-E (E s) layer in the E region and medium-scale traveling ionospheric disturbances (MSTIDs) in the F region, both of which often show northwest–southeast alignment and propagate southwestward in the Northern Hemisphere. The Perkins instability in the F region and the E s-layer instability in the E region can produce the tilted structure, but the growth rate of the Perkins instability alone cannot account for the observed MSTIDs. The electrodynamical coupling between these instabilities is now believed to be an important factor for the rapid growth of MSTIDs. From recent numerical studies, it is found that the polarization process in the E region is essential for the full development of MSTIDs as well as for the seeding of NW-SE perturbation in the F region. Further observations to identify the cause and effect of the coupling process are required in the future.


Magnetic Field Line Coupling Process Polarization Electric Field Radar Echo Midlatitude Ionosphere 
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.



The author was supported by Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellowships for Research Abroad for the present work at Cornell University, USA.


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© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.NASA Goddard Space Flight CenterGreenbeltUSA

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