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 23, issue 5
Ann. Geophys., 23, 1747–1754, 2005
https://doi.org/10.5194/angeo-23-1747-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 1747–1754, 2005
https://doi.org/10.5194/angeo-23-1747-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 Jul 2005

28 Jul 2005

The electron energy distribution during HF pumping, a picture painted with all colors

B. Gustavsson1, T. Sergienko2, M. J. Kosch3, M. T. Rietveld4, B. U. E. Brändström2, T. B. Leyser5, B. Isham6, P. Gallop7, T. Aso1, M. Ejiri1, T. Grydeland8, Å. Steen9, C. LaHoz8, K. Kaila10, J. Jussila10, and H. Holma10 B. Gustavsson et al.
  • 1National Institute of Polar Research, Tokyo, Japan
  • 2Swedish Institute of Space Physics, Kiruna, Sweden
  • 3Department of Communication Systems, Lancaster University, Lancaster, England, UK
  • 4EISCAT, Ramfjordmoen, Norway
  • 5Swedish Institute of Space Physics, Uppsala, Sweden
  • 6EISCAT Scientific Association, Longyearbyen, Norway
  • 7Rutherford Appleton Laboratory, UK
  • 8Dept. of Physics, University of Tromsø, Tromsø, Norway
  • 9Remspace Inc., Linköping, Sweden
  • 10Oulo University, Oulu, Finland

Abstract. The shape of the electron energy distribution has long been a central question in the field of high-frequency radio-induced optical emission experiments. This report presents estimates of the electron energy distribution function, fe(E), from 0 to 60 eV, based on optical multi-wavelength (6300, 5577, 8446, 4278Å) data and 930-MHz incoherent scatter radar measurements of ion temperature, electron temperature and electron concentration. According to our estimate, the electron energy distribution has a depression at around 2 eV, probably caused by electron excitation of vibrational states in N2, and a high energy tail that is clearly supra-thermal. The temporal evolution of the emissions indicates that the electron temperature still plays an important role in providing electrons with energies close to 2 eV. At the higher energies the electron energy distribution has a non-thermal tail.

Keywords. Active experiments; Ionosphere atmosphere interaction; Ionospheric physics

Publications Copernicus
Download
Citation