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Ann. Geophys., 24, 367-379, 2006
www.ann-geophys.net/24/367/2006/
© European Geosciences Union 2006
Enhancement of electric and magnetic wave fields at density gradients
A. Reiniusson1, G. Stenberg1,2, P. Norqvist1, A. I. Eriksson2, and K. Rönnmark1
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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