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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 28, issue 9
Ann. Geophys., 28, 1749-1759, 2010
https://doi.org/10.5194/angeo-28-1749-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 1749-1759, 2010
https://doi.org/10.5194/angeo-28-1749-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 Sep 2010

28 Sep 2010

Ray tracing analysis of L mode pumping of the ionosphere, with implications for the magnetic zenith effect

E. Nordblad and T. B. Leyser E. Nordblad and T. B. Leyser
  • Swedish Institute of Space Physics, P.O. Box 537, 751 21 Uppsala, Sweden

Abstract. Using ray tracing of ordinary mode HF waves in an ionosphere with kilometre-scale field aligned density depletions, or ducts, we find that transmission across the plasma resonance becomes possible at new locations as rays are guided into the so-called L mode. Stronger transmitted fields are seen in some directions, notably at inclinations close to the vertical or the magnetic zenith (MZ). It is argued that the results could have implications for the magnetic zenith effect, i.e., the increased plasma response that has been observed around the MZ.

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