A new mechanism of whistler wave generation by Amplitude modulated HF waves in the polar electrojet

Spencer Kuo, E. Koretzky, M. C. Lee

Research output: Contribution to journalArticle

Abstract

It is shown that a spatially distributed mode current of whistler waves, oscillating at the modulation frequency of the ground-transmitted powerful HF wave, can be induced in the E-region of the high-latitude ionosphere through the coupling between HF wave-modulated electrojet current and induced density irregularities. As shown in Kuo et. al. [1999], these density irregularities generated by the HF wave via a thermal instability vary periodically along the geomagnetic field. This current produces whistler waves directly rather than through an antenna radiation process. This mechanism generates whistler waves in the VLF range (3-30 KHz) with reduced harmonic components. The frequencies of produced whistler waves depend on the polarization, frequency, power, and modulation scheme of the HF wave. It is predicted that whistler waves at frequencies around 25 KHz can be most favorably excited, awaiting the corroboration of future ionospheric heating experiments.

Original languageEnglish (US)
Pages (from-to)1677-1680
Number of pages4
JournalGeophysical Research Letters
Volume26
Issue number12
StatePublished - 1999

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electrojets
wave generation
electrojet
irregularities
ionospheric heating
thermal instability
E region
geomagnetism
geomagnetic field
polar regions
frequency modulation
ionospheres
antenna
ionosphere
polarization
antennas
current density
heating
harmonics
modulation

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

A new mechanism of whistler wave generation by Amplitude modulated HF waves in the polar electrojet. / Kuo, Spencer; Koretzky, E.; Lee, M. C.

In: Geophysical Research Letters, Vol. 26, No. 12, 1999, p. 1677-1680.

Research output: Contribution to journalArticle

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