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Related Experiment Videos

Ionospheric modification at twice the electron cyclotron frequency.

F T Djuth1, T R Pedersen, E A Gerken

  • 1Geospace Research, Inc., El Segundo, California 90245, USA.

Physical Review Letters
|May 21, 2005
PubMed
Summary

The High-frequency Active Auroral Research Program (HAARP) facility observed enhanced airglow when transmission frequencies matched the second electron cyclotron harmonic. This indicates the presence of accelerated electrons in the ionosphere.

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Area of Science:

  • Space Physics
  • Atmospheric Science
  • Plasma Physics

Background:

  • The High-frequency Active Auroral Research Program (HAARP) facility was upgraded in 2004 with a new transmission band.
  • This band covers the second electron cyclotron harmonic at altitudes of 220-330 km.

Purpose of the Study:

  • To investigate the effects of the new HAARP transmission band on the ionosphere.
  • To analyze the relationship between transmission frequency and observed airglow emissions.

Main Methods:

  • Utilizing the HAARP facility's high-frequency transmission capabilities.
  • Observing and measuring airglow emissions at specific altitudes.
  • Correlating optical emissions with transmission frequencies and plasma characteristics.

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Main Results:

  • Greatly enhanced airglow was observed when transmission frequency matched the second electron cyclotron harmonic at the upper hybrid resonance height.
  • This phenomenon is contrary to observations at higher electron cyclotron harmonics.
  • Measured optical emissions provided evidence for accelerated electrons within the plasma.

Conclusions:

  • The HAARP facility's second electron cyclotron harmonic band can induce significant ionospheric disturbances.
  • Accelerated electrons are confirmed by optical emissions, impacting ionospheric plasma behavior.
  • Findings offer new insights into high-frequency wave-particle interactions in the ionosphere.