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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 7
Ann. Geophys., 24, 1819–1827, 2006
https://doi.org/10.5194/angeo-24-1819-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 1819–1827, 2006
https://doi.org/10.5194/angeo-24-1819-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  09 Aug 2006

09 Aug 2006

Directional features of the downshifted peak observed in HF-induced stimulated electromagnetic emission spectra obtained using an interferometer

E. D. Tereshchenko1, R. Yu. Yurik1, B. Z. Khudukon1, M. T. Rietveld2, B. Isham3, V. Belyey4, A. Brekke4, T. Hagfors5, and M. Grill6 E. D. Tereshchenko et al.
  • 1Polar Geophysical Institute, Murmansk, Russia
  • 2EISCAT Scientific Association, Ramfjordbotn, Norway
  • 3Interamerican University, Bayamón, Puerto Rico, USA
  • 4University of Tromsø, Tromsø, Norwaya
  • 5Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany
  • 6Lancaster University, Lancaster, UK

Abstract. A high frequency (HF) ionospheric modification experiment was carried out between 25 September and 8 October 2004, using the EISCAT HF transmitter located near Tromsø, Norway. During this experiment the spectra of the stimulated HF sideband waves (stimulated electromagnetic emission or SEE) induced by the HF pump were observed using an interferometer consisting of three spaced receiving antennas with baselines both along and perpendicular to the meridian, and a multi-channel coherent receiver, installed in the vicinity of the HF facility. The transmitter operated at 4040kHz and its antenna beam was scanned to angles of 0°, 7°, 14°, and 21° south from vertical, pausing 4min at each position. This paper focuses on features of the downshifted peak (DP) emission, which has not been as thoroughly studied as many of the other SEE spectral features observable within the EISCAT pump frequency range. It was found that the signal-weighted direction of the DP source region remained within 5° of magnetic zenith as the HF beam was tilted between 0 and 21° south of vertical.

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