Theoretical study of the ionospheric plasma cave in the equatorial ionization anomaly region

Yu Tsung Chen, C. H. Lin, C. H. Chen, J. Y. Liu, J. D. Huba, L. C. Chang, H. L. Liu, J. T. Lin, P. K. Rajesh

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2 Citations (Scopus)

Abstract

This paper investigates the physical mechanism of an unusual equatorial electron density structure, plasma cave, located underneath the equatorial ionization anomaly by using theoretical simulations. The simulation results provide important new understanding of the dynamics of the equatorial ionosphere. It has been suggested previously that unusual E×B drifts might be responsible for the observed plasma cave structure, but model simulations in this paper suggest that the more likely cause is latitudinal meridional neutral wind variations. The neutral winds are featured by two divergent wind regions at off-equator latitudes and a convergent wind region around the magnetic equator, resulting in plasma divergences and convergence, respectively, to form the plasma caves structure. The tidal-decomposition analysis further suggests that the cave related meridional neutral winds and the intensity of plasma cave are highly associated with the migrating terdiurnal tidal component of the neutral winds.

Original languageEnglish
Pages (from-to)10,324-10,335
JournalJournal of Geophysical Research: Space Physics
Volume119
Issue number12
DOIs
Publication statusPublished - 2014 Dec

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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