Articles | Volume 24, issue 1
https://doi.org/10.5194/angeo-24-367-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.Enhancement of electric and magnetic wave fields at density gradients
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.