Generation of ELF and VLF waves by a thermal instability excited in the HF heater‐modulated polar electrojet

S. P. Kuo

Research output: Contribution to journalArticle

Abstract

A thermal instability responding to the modulation of polar electrojet by HF heater as a potential efficient mechanism for the generation of ELF and VLF waves has been investigated. It is shown that a positive feedback through the electron‐neutral collisional heating process can cause the transient response of the plasma to the modulated HF heater to grow exponentially. Considering a sinusoidally modulated HF heater wave having its field amplitude proportional to | cosω1t/2 |, the threshold fields of the thermal instability under normal electrojet conditions are found to be about 1.6 V m−1 and 0.8 V m−1 for the o mode and x mode operation respectively. For a heater wave field of 2 V m−1, the instability can be excited by the x mode heater within a few milliseconds and also by the o mode heater but taking about 9 times as long.

Original languageEnglish (US)
Pages (from-to)1019-1027
Number of pages9
JournalRadio Science
Volume28
Issue number6
DOIs
StatePublished - 1993

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Earth and Planetary Sciences(all)
  • Electrical and Electronic Engineering

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