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Ann. Geophys., 23, 47-53, 2005
www.ann-geophys.net/23/47/2005/
© European Geosciences Union 2005
HF-induced airglow at magnetic zenith: theoretical considerations
E. V. Mishin1, W. J. Burke2, and T. Pedersen2
1Boston College, Institute for Scientific Research, Chestnut Hill, Massachusetts, USA
2Air Force Research Laboratory, Space Vehicles Directorate, Hanscom Air Force Base, MA 01731, USA
Abstract. Observations of airglow at 630nm (red line) and 557.7nm (green line)
during HF modification experiments at the High Frequency Active Auroral
Research Program (HAARP) heating facility are analyzed. We propose a
theoretical framework for understanding the generation of Langmuir and ion
acoustic waves during magnetic zenith injections. We show that observations
of HF-induced airglow in an underdense ionosphere as well as a decrease in
the height of the emitting volume are consistent with this scenario.
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