Ionospheric modification at twice the electron cyclotron frequency

F. T. Djuth, T. R. Pedersen, E. A. Gerken, P. A. Bernhardt, C. A. Selcher, W. A. Bristow, M. J. Kosch

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Abstract

In 2004, a new transmission band was added to the HAARP high-frequency ionospheric modification facility that encompasses the second electron cyclotron harmonic at altitudes between ∼220 and 330 km. Initial observations indicate that greatly enhanced airglow occurs whenever the transmission frequency approximately matches the second electron cyclotron harmonic at the height of the upper hybrid resonance. This is the reverse of what happens at higher electron cyclotron harmonics. The measured optical emissions confirm the presence of accelerated electrons in the plasma.

Original languageEnglish (US)
Article number125001
JournalPhysical review letters
Volume94
Issue number12
DOIs
StatePublished - Apr 1 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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