HF wave propagation and induced ionospheric turbulence in the magnetic equatorial region

B. Eliasson, K. Papadopoulos

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The propagation and excitation of Artificial Ionospheric Turbulence (AIT) in the magnetic equatorial region by high frequency (HF) electromagnetic (EM) waves injected into the overhead ionospheric layer is examined. EM waves with ordinary (O) mode polarization reach the critical layer only if their incidence angle is within the Spitze cone. Near the critical layer the wave electric field is linearly polarized and directed parallel to the magnetic field lines. For large enough amplitudes, the O mode becomes unstable to the 4-wave oscillating two-stream instability (OTSI) and the 3-wave parametric decay instability (PDI) driving large amplitude Langmuir and ion acoustic waves. The interaction between the induced Langmuir turbulence and electrons located within the 50-100 km wide transmitter heating cone at an altitude of 230 km can potentially accelerate the electrons along the magnetic field to several tens to a few hundreds of eV, far beyond the thresholds for optical emissions and ionization of the neutral gas. It could furthermore result in generation of shear Alfvén waves such as have been recently observed in laboratory experiments at the UCLA Large Plasma Device (LAPD).
LanguageEnglish
Pages2727-2742
Number of pages16
JournalJournal of Geophysical Research: Space Physics
Volume121
Issue number3
Early online date18 Mar 2016
DOIs
Publication statusPublished - 31 Mar 2016

Fingerprint

equatorial regions
ionospherics
wave propagation
turbulence
electromagnetic wave
electromagnetic radiation
cones
Langmuir turbulence
magnetic field
electron
ion acoustic waves
neutral gases
acoustic wave
magnetohydrodynamic waves
magnetic fields
transmitters
light emission
S-wave
electric field
ionization

Keywords

  • artificial ionospheric turbulence
  • electromagnetic waves
  • high frequency
  • Alfven waves
  • magnetic equitorial region

Cite this

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title = "HF wave propagation and induced ionospheric turbulence in the magnetic equatorial region",
abstract = "The propagation and excitation of Artificial Ionospheric Turbulence (AIT) in the magnetic equatorial region by high frequency (HF) electromagnetic (EM) waves injected into the overhead ionospheric layer is examined. EM waves with ordinary (O) mode polarization reach the critical layer only if their incidence angle is within the Spitze cone. Near the critical layer the wave electric field is linearly polarized and directed parallel to the magnetic field lines. For large enough amplitudes, the O mode becomes unstable to the 4-wave oscillating two-stream instability (OTSI) and the 3-wave parametric decay instability (PDI) driving large amplitude Langmuir and ion acoustic waves. The interaction between the induced Langmuir turbulence and electrons located within the 50-100 km wide transmitter heating cone at an altitude of 230 km can potentially accelerate the electrons along the magnetic field to several tens to a few hundreds of eV, far beyond the thresholds for optical emissions and ionization of the neutral gas. It could furthermore result in generation of shear Alfv{\'e}n waves such as have been recently observed in laboratory experiments at the UCLA Large Plasma Device (LAPD).",
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HF wave propagation and induced ionospheric turbulence in the magnetic equatorial region. / Eliasson, B.; Papadopoulos, K.

In: Journal of Geophysical Research: Space Physics, Vol. 121, No. 3, 31.03.2016, p. 2727-2742.

Research output: Contribution to journalArticle

TY - JOUR

T1 - HF wave propagation and induced ionospheric turbulence in the magnetic equatorial region

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AU - Papadopoulos, K.

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N2 - The propagation and excitation of Artificial Ionospheric Turbulence (AIT) in the magnetic equatorial region by high frequency (HF) electromagnetic (EM) waves injected into the overhead ionospheric layer is examined. EM waves with ordinary (O) mode polarization reach the critical layer only if their incidence angle is within the Spitze cone. Near the critical layer the wave electric field is linearly polarized and directed parallel to the magnetic field lines. For large enough amplitudes, the O mode becomes unstable to the 4-wave oscillating two-stream instability (OTSI) and the 3-wave parametric decay instability (PDI) driving large amplitude Langmuir and ion acoustic waves. The interaction between the induced Langmuir turbulence and electrons located within the 50-100 km wide transmitter heating cone at an altitude of 230 km can potentially accelerate the electrons along the magnetic field to several tens to a few hundreds of eV, far beyond the thresholds for optical emissions and ionization of the neutral gas. It could furthermore result in generation of shear Alfvén waves such as have been recently observed in laboratory experiments at the UCLA Large Plasma Device (LAPD).

AB - The propagation and excitation of Artificial Ionospheric Turbulence (AIT) in the magnetic equatorial region by high frequency (HF) electromagnetic (EM) waves injected into the overhead ionospheric layer is examined. EM waves with ordinary (O) mode polarization reach the critical layer only if their incidence angle is within the Spitze cone. Near the critical layer the wave electric field is linearly polarized and directed parallel to the magnetic field lines. For large enough amplitudes, the O mode becomes unstable to the 4-wave oscillating two-stream instability (OTSI) and the 3-wave parametric decay instability (PDI) driving large amplitude Langmuir and ion acoustic waves. The interaction between the induced Langmuir turbulence and electrons located within the 50-100 km wide transmitter heating cone at an altitude of 230 km can potentially accelerate the electrons along the magnetic field to several tens to a few hundreds of eV, far beyond the thresholds for optical emissions and ionization of the neutral gas. It could furthermore result in generation of shear Alfvén waves such as have been recently observed in laboratory experiments at the UCLA Large Plasma Device (LAPD).

KW - artificial ionospheric turbulence

KW - electromagnetic waves

KW - high frequency

KW - Alfven waves

KW - magnetic equitorial region

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