Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.585 IF 1.585
  • IF 5-year value: 1.698 IF 5-year
    1.698
  • CiteScore value: 1.62 CiteScore
    1.62
  • SNIP value: 0.820 SNIP 0.820
  • IPP value: 1.52 IPP 1.52
  • SJR value: 0.781 SJR 0.781
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 83 Scimago H
    index 83
  • h5-index value: 24 h5-index 24
Volume 25, issue 3
Ann. Geophys., 25, 689–700, 2007
https://doi.org/10.5194/angeo-25-689-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 689–700, 2007
https://doi.org/10.5194/angeo-25-689-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  29 Mar 2007

29 Mar 2007

On the location and structure of the artificial 630-nm airglow patch over Sura facility

S. M. Grach1,2, M. J. Kosch3,4,5, V. A. Yashnov1, E. N. Sergeev2, M. A. Atroshenko1, and P. V. Kotov1,2 S. M. Grach et al.
  • 1Radiophysics Faculty, State University of Nizhny Novgorod, Russia
  • 2Radiophysical Research Institute, Nizhny Novgorod, Russia
  • 3Communication Systems, Lancaster University, Lancaster LA1 4WA, UK
  • 4Honorary Research Fellow, University of Kwazulu-Natal, Durban 4001, South Africa
  • 5Currently at Space Vehicles Directorate, Air Force Research Laboratory, Hanscom Air Force Base, MA, USA

Abstract. Results are presented of the artificial optical emission of the atomic oxygen red line (the radiation of level O(1D) with a wavelength of 630 nm) from the HF-pumped ionosphere, obtained in September 2004 at the SURA heating facility situated near Nizhny Novgorod, Russia. For vertical pumping the airglow patch was increasingly displaced to the north, up to 7–8°, with increasing reflection altitude. For large brightness of the emission, the airglow patch started to develop at the northern edge of the pump beam and later expanded to the south. These effects are attributed to the precipitation of supra-thermal electrons from the pump wave upper hybrid resonance altitude to lower altitudes where excitation of the O(1D) level is more effective due to the larger density of atomic oxygen, and the O(1D) lifetime is shorter. For a pump beam inclination of 12° to the south, the optical spot was displaced by 4–5° to the south relative to the straight-line projection of the pump beam onto the sky. This exceeds that expected from the ray tracing and may be related, most probably, to the so-called "magnetic zenith" effect. In addition, mid-scale (1–10 km) magnetic field-aligned structures were observed in the pumped volume of the ionosphere. The east-west motions of the airglow patches are also analyzed.

Publications Copernicus
Download
Citation