Numerical Modeling of the Concentric Gravity Wave Seeding of Low-Latitude Nighttime Medium-Scale Traveling Ionospheric Disturbances

Min Yang Chou, Charles C.H. Lin, Joseph D. Huba, Chuan Ping Lien, Chia Hung Chen, Jia Yue, Loren C. Chang, P. K. Rajesh

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The first-principles three-dimensional ionosphere model Naval Research Laboratory SAMI3/ESF is used to study the low-latitude nighttime medium-scale traveling ionospheric disturbances (MSTIDs) triggered by the typhoon-induced concentric gravity waves (CGWs) for the first time. Simulation results demonstrate that the electrodynamic coupling between CGWs and Perkins instability can initiate the rarely observed low-latitude nighttime MSTIDs by accelerating their growth rates. Both the simulations and observations show that the westward and westward/equatorward propagating CGWs with similar wavefront alignments to the Perkins instability could enhance the generation of MSTIDs rather than the northward propagating CGWs. The CGWs penetrating to the ionospheric F layer without severe dissipation can induce greater polarization electric fields to accelerate the Perkins instability via E × B drifts.

Original languageEnglish
Pages (from-to)6390-6399
Number of pages10
JournalGeophysical Research Letters
Volume45
Issue number13
DOIs
StatePublished - 16 Jul 2018

Keywords

  • equatorial ionosphere
  • gravity wave
  • nighttime MSTIDs
  • numerical modeling
  • SAMI3/ESF

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