Ionospheric modifications in high frequency heating experiments

Research output: Contribution to journalArticle

Abstract

Featured observations in high-frequency (HF) heating experiments conducted at Arecibo, EISCAT, and high frequency active auroral research program are discussed. These phenomena appearing in the F region of the ionosphere include high-frequency heater enhanced plasma lines, airglow enhancement, energetic electron flux, artificial ionization layers, artificial spread-F, ionization enhancement, artificial cusp, wideband absorption, short-scale (meters) density irregularities, and stimulated electromagnetic emissions, which were observed when the O-mode HF heater waves with frequencies below foF2 were applied. The implication and associated physical mechanism of each observation are discussed and explained. It is shown that these phenomena caused by the HF heating are all ascribed directly or indirectly to the excitation of parametric instabilities which instigate anomalous heating. Formulation and analysis of parametric instabilities are presented. The results show that oscillating two stream instability and parametric decay instability can be excited by the O-mode HF heater waves, transmitted from all three heating facilities, in the regions near the HF reflection height and near the upper hybrid resonance layer. The excited Langmuir waves, upper hybrid waves, ion acoustic waves, lower hybrid waves, and field-aligned density irregularities set off subsequent wave-wave and wave-electron interactions, giving rise to the observed phenomena.

Original languageEnglish (US)
Article number012901
JournalPhysics of Plasmas
Volume22
Issue number1
DOIs
StatePublished - Jan 1 2015

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ionospherics
heating
heaters
irregularities
spread F
ionization
airglow
electron flux
ion acoustic waves
augmentation
F region
cusps
ionospheres
electron scattering
electromagnetism
broadband
formulations
decay
excitation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Ionospheric modifications in high frequency heating experiments. / Kuo, Spencer.

In: Physics of Plasmas, Vol. 22, No. 1, 012901, 01.01.2015.

Research output: Contribution to journalArticle

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