Active ionospheric experiments using high-power, high-frequency transmitters,“heaters”, to
study plasma processes in the ionosphere and magnetosphere continue to provide new …

Theory and observations of Langmuir waves and turbulence induced in the auroral
ionosphere by electron beams of magnetospheric-origin are reviewed. The theoretical …

We report on a novel scenario of subauroral arcs within strong subauroral ion drifts (SAID)‐
STEVE and Picket Fence. Their explanation requires a local source of low‐energy, ε< 18.75 …

High‐power ordinary mode radio waves produce artificial ionization in the F region
ionosphere at the European Incoherent Scatter (Tromsø, Norway) and High Frequency …

Observations of HF‐induced artificial optical emissions at the 3.6 MW HAARP facility show
unexpected features not seen at the previous 960 kW level. Optical emissions often form a …

We report on satellite observations of plasma density enhancements (ducts) in the topside
ionosphere during four HAARP/BRIOCHE campaigns during 2009–2010. Artificial ducts …

We report on artificial descending plasma layers created in the ionosphere F region by high-
power high-frequency (HF) radio waves from High-frequency Active Auroral Research …

The shape of the electron energy distribution has long been a central question in the field of
high-frequency radio-induced optical emission experiments. This report presents estimates …

We presented experimental results of strong plasma modifications induced by X-mode
powerful HF radio waves injected towards the magnetic zenith into the high latitude F region …

On 4 February 2005 the High‐Frequency Active Auroral Research Program (HAARP) facility
was operated at 2.85 MHz to produce artificial optical emissions in the ionosphere while …