Articles | Volume 23, issue 1
Ann. Geophys., 23, 47–53, 2005
https://doi.org/10.5194/angeo-23-47-2005

Special issue: Eleventh International EISCAT Workshop

Ann. Geophys., 23, 47–53, 2005
https://doi.org/10.5194/angeo-23-47-2005

  31 Jan 2005

31 Jan 2005

HF-induced airglow at magnetic zenith: theoretical considerations

E. V. Mishin1, W. J. Burke2, and T. Pedersen2 E. V. Mishin et al.
  • 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.