Articles | Volume 24, issue 1
Ann. Geophys., 24, 367–379, 2006
https://doi.org/10.5194/angeo-24-367-2006
Ann. Geophys., 24, 367–379, 2006
https://doi.org/10.5194/angeo-24-367-2006

  07 Mar 2006

07 Mar 2006

Enhancement of electric and magnetic wave fields at density gradients

A. Reiniusson1, G. Stenberg1,2, P. Norqvist1, A. I. Eriksson2, and K. Rönnmark1 A. Reiniusson et al.
  • 1Department of Physics, Umeå University, Umeå, Sweden
  • 2Swedish Institute of Space Physics, Uppsala, Sweden

Abstract. We use Freja satellite data to investigate irregular small-scale density variations. The observations are made in the auroral region at about 1000-1700 km. The density variations are a few percent, and the structures are found to be spatial down to a scale length of a few ion gyroradii. Irregular density variations are often found in an environment of whistler mode/lower hybrid waves and we show that at the density gradients both the electric and magnetic wave fields are enhanced.

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