Journal cover Journal topic
Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 24, 1819-1827, 2006
http://www.ann-geophys.net/24/1819/2006/
doi:10.5194/angeo-24-1819-2006
© Author(s) 2006. This work is distributed
under the Creative Commons Attribution 3.0 License.
 
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 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.

Citation: Tereshchenko, E. D., Yurik, R. Yu., Khudukon, B. Z., Rietveld, M. T., Isham, B., Belyey, V., Brekke, A., Hagfors, T., and Grill, M.: Directional features of the downshifted peak observed in HF-induced stimulated electromagnetic emission spectra obtained using an interferometer, Ann. Geophys., 24, 1819-1827, doi:10.5194/angeo-24-1819-2006, 2006.
Publications Copernicus
Download
Share