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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. Stenberg^1,2, P. Norqvist¹, A. I. Eriksson², and K. Rönnmark^1
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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Citation: Reiniusson, A., Stenberg, G., Norqvist, P., Eriksson, A. I., and Rönnmark, K.: Enhancement of electric and magnetic wave fields at density gradients, Ann. Geophys., 24, 367-379, 2006.   Bibtex   EndNote   Reference Manager