Jürgen Röttger

TL;DR: In this article, the authors examine both the data collected and the theories proposed, with a special focus on the relationship between PMSEs and noctilucent clouds (NLCs).

TL;DR: In this article, the authors explored the idea that heavy water cluster ions in this uniquely cold region of the atmosphere could be responsible because, in the presence of these ions, the enhanced, turbulence-driven spectrum of the ionization irregularities could extend to considerably shorter wavelengths than that of the neutral turbulence itself.

TL;DR: In this article, the received power due to partial reflection and turbulence scattering of VHF radar echoes from the clear atmosphere is estimated under rather general conditions and partial reflections from stratified layers in the atmosphere can contribute significantly to the received echo power and therefore should be considered in data interpretation.

TL;DR: The ESR system design was adapted to make use of commercial off‐the‐shelf TV transmitter hardware, thereby reducing design risk, lead times, and cost to a minimum, and it is now being operated by EISCAT staff on a campaign basis, to provide ground‐based support data for a number of other magnetospheric satellites, notably Polar and FAST.

TL;DR: In this article, the Tropopause level as well as a criterion on the stability of the lower stratosphere can be deduced from the results of radar investigations of the middle atmosphere, and the basic parameters, such as mean and fluctuating velocities, reflectivity and persistency of atmospheric structures, are defined.