HF radio wave acceleration of ionospheric electrons

Analysis of HF-induced optical enhancements

Björn Gustavsson, Bengt Eliasson

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The shape of the HF-pump modified electron energy distribution has long been a central question in the field of ionospheric high-frequency radio wave modification experiments. Here we present estimates of the enhanced differential electron flux, from 1.9 to 100 eV based on optical multiwavelength (6300, 5577, 8446, and 4278 Å) data and 930 MHz incoherent scatter radar measurements of ion temperature, electron temperature and concentration. According to our estimate, the electron energy distribution is depleted in the energy range of 2 to approximately 4 eV, probably caused by electron excitation of vibrational states in N2. At the higher energies the electron energy distribution has a nonthermal tail. Further we show that the altitude variations of the four optical emissions should differ both in altitude coverage and center altitude.
Original languageEnglish
Article numberA08319
Number of pages14
JournalJournal of Geophysical Research: Space Physics
Volume113
Issue numberA8
DOIs
Publication statusPublished - 28 Aug 2008

Fingerprint

radio waves
ionospherics
electron energy
energy distribution
augmentation
electrons
incoherent scatter radar
radar measurement
electron flux
estimates
ion temperature
vibrational states
light emission
pumps
energy
excitation

Keywords

  • ionosphere
  • HF heating
  • accelerated electrons
  • optical emissions
  • optical enhancements
  • HF radio
  • wave acceleration
  • ionospheric electrons
  • analysis
  • HF-induced

Cite this

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abstract = "The shape of the HF-pump modified electron energy distribution has long been a central question in the field of ionospheric high-frequency radio wave modification experiments. Here we present estimates of the enhanced differential electron flux, from 1.9 to 100 eV based on optical multiwavelength (6300, 5577, 8446, and 4278 {\AA}) data and 930 MHz incoherent scatter radar measurements of ion temperature, electron temperature and concentration. According to our estimate, the electron energy distribution is depleted in the energy range of 2 to approximately 4 eV, probably caused by electron excitation of vibrational states in N2. At the higher energies the electron energy distribution has a nonthermal tail. Further we show that the altitude variations of the four optical emissions should differ both in altitude coverage and center altitude.",
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HF radio wave acceleration of ionospheric electrons : Analysis of HF-induced optical enhancements. / Gustavsson, Björn; Eliasson, Bengt.

In: Journal of Geophysical Research: Space Physics, Vol. 113, No. A8, A08319, 28.08.2008.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Gustavsson, Björn

AU - Eliasson, Bengt

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AB - The shape of the HF-pump modified electron energy distribution has long been a central question in the field of ionospheric high-frequency radio wave modification experiments. Here we present estimates of the enhanced differential electron flux, from 1.9 to 100 eV based on optical multiwavelength (6300, 5577, 8446, and 4278 Å) data and 930 MHz incoherent scatter radar measurements of ion temperature, electron temperature and concentration. According to our estimate, the electron energy distribution is depleted in the energy range of 2 to approximately 4 eV, probably caused by electron excitation of vibrational states in N2. At the higher energies the electron energy distribution has a nonthermal tail. Further we show that the altitude variations of the four optical emissions should differ both in altitude coverage and center altitude.

KW - ionosphere

KW - HF heating

KW - accelerated electrons

KW - optical emissions

KW - optical enhancements

KW - HF radio

KW - wave acceleration

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KW - analysis

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