M. H. Boehm

TL;DR: Shear Alfven waves with amplitudes greater than 100 mV/m were observed on two recent sounding rocket flights as mentioned in this paper, showing a downward propagation direction and implying insignificant reflection from the ionosphere at frequencies greater than 1 Hz.

TL;DR: In this article, a model of the electromagnetic ion cyclotron wave was proposed and it was shown that the parallel phase velocity of the wave increase as the wave propagates toward the ionosphere, and that ionospheric electrons trapped or reflected by the wave are accelerated to energies of several keV.

TL;DR: In this article, an improved analysis technique based on the quantity |δE/(δn/n)| versus frequency and applied to the Freja plasma wave measurements is presented, which can be used to infer the dispersion relation for the measured emission as well as give estimates of the thermal plasma temperatures.

TL;DR: In this paper, extreme low-frequency (ELF) magnetic and electric field plasma wave emissions were recorded on 2 October 1993 on auroral field lines by the Magnetic Field Experiment during Freja orbit 4770.

TL;DR: In this paper, the authors studied several Freja passes at ≈1700 km altitude with long time periods of plasma depletion and transverse ion acceleration and found that the density may decrease by more than two orders of magnitude (from 1000 to ≈10 cm−3).