Simulation study of the interaction between large-amplitude HF radio waves and the ionosphere

B. Eliasson, B. Thidé

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The time evolution of a large-amplitude electromagnetic (EM) wave injected vertically into the overhead ionosphere is studied numerically. The EM wave has a carrier frequency of 5 MHz and is modulated as a Gaussian pulse with a width of approximately 0.1 milliseconds and a vacuum amplitude of 1.5 V/m at 50 km. This is a fair representation of a modulated radio wave transmitted from a typical high-power HF broadcast station on the ground. The pulse is propagated through the neutral atmosphere to the critical points of the ionosphere, where the L-O and R-X modes are reflected, and back to the neutral atmosphere. We observe mode conversion of the L-O mode to electrostatic waves, as well as harmonic generation at the turning points of both the R-X and L-O modes, where their amplitudes rise to several times the original ones. The study has relevance for ionospheric interaction experiments in combination with ground-based and satellite or rocket observations.
LanguageEnglish
Article numberL06106
Number of pages7
JournalGeophysical Research Letters
Volume34
Issue number6
DOIs
Publication statusPublished - 30 Mar 2007

Fingerprint

radio wave
radio waves
ionospheres
ionosphere
electromagnetic wave
neutral atmospheres
simulation
electromagnetic radiation
atmosphere
interactions
electrostatic waves
wave generation
satellite observation
carrier frequencies
pulses
rockets
ionospherics
critical point
harmonic generations
stations

Keywords

  • ionosphere
  • radio wave propagation
  • nonlinear

Cite this

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Simulation study of the interaction between large-amplitude HF radio waves and the ionosphere. / Eliasson, B.; Thidé, B.

In: Geophysical Research Letters, Vol. 34, No. 6, L06106, 30.03.2007.

Research output: Contribution to journalArticle

TY - JOUR

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N2 - The time evolution of a large-amplitude electromagnetic (EM) wave injected vertically into the overhead ionosphere is studied numerically. The EM wave has a carrier frequency of 5 MHz and is modulated as a Gaussian pulse with a width of approximately 0.1 milliseconds and a vacuum amplitude of 1.5 V/m at 50 km. This is a fair representation of a modulated radio wave transmitted from a typical high-power HF broadcast station on the ground. The pulse is propagated through the neutral atmosphere to the critical points of the ionosphere, where the L-O and R-X modes are reflected, and back to the neutral atmosphere. We observe mode conversion of the L-O mode to electrostatic waves, as well as harmonic generation at the turning points of both the R-X and L-O modes, where their amplitudes rise to several times the original ones. The study has relevance for ionospheric interaction experiments in combination with ground-based and satellite or rocket observations.

AB - The time evolution of a large-amplitude electromagnetic (EM) wave injected vertically into the overhead ionosphere is studied numerically. The EM wave has a carrier frequency of 5 MHz and is modulated as a Gaussian pulse with a width of approximately 0.1 milliseconds and a vacuum amplitude of 1.5 V/m at 50 km. This is a fair representation of a modulated radio wave transmitted from a typical high-power HF broadcast station on the ground. The pulse is propagated through the neutral atmosphere to the critical points of the ionosphere, where the L-O and R-X modes are reflected, and back to the neutral atmosphere. We observe mode conversion of the L-O mode to electrostatic waves, as well as harmonic generation at the turning points of both the R-X and L-O modes, where their amplitudes rise to several times the original ones. The study has relevance for ionospheric interaction experiments in combination with ground-based and satellite or rocket observations.

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