May 2024 auroras were caused by experiments from High-frequency Active Auroral Research Program (HAARP) experiments
Alaskans and visitors may be able to see an artificial airglow in the sky created by the High-frequency Active Auroral Research Program during a four-day research campaign that starts Saturday. [...] HAARP creates airglow by exciting electrons in Earth’s ionosphere, similar to how solar energy creates natural aurora, with on and off pulses of high-frequency radio transmissions. HAARP’s Ionospheric Research Instrument, a phased array of 180 high-frequency antennas spread across 33 acres, can radiate 3.6 megawatts into the upper atmosphere and ionosphere. [...] HAARP will create an airglow at a specific point in the sky. The angle of visibility for anyone wanting to look for it will depend on a person’s distance from HAARP.