References and further reading

1. HAARP website

2. Large ionospheric disturbances produced by the HAARP HF facility

3. Observations of artificial and natural optical emissions at the HAARP facility 

4. History and applications of HAARP technologies: the High Frequency Active Auroral Research Program

5. HAARP, the most powerful ionosphere heater on Earth

6. Optical ring formation and ionization production in high-power HF heating experiments at HAARP

7. Artificial Aurora Produced by HAARP

8. Reception of Transatlantic Radio signals, 1901

9. Fessenden and Marconi: Their Differing Technologies and Transatlantic Experiments During the First Decade of this Century

10. Creation of visible artificial optical emissions in the aurora by high-power radio waves

11. Signal Hill National Historic Site

12. Artificial Earthquakes

13. FM Radio Wave Based Early Earthquake Detection

14. Earthquake conspiracy discussion on Twitter

15. Anomalous pre-seismic transmission of VHF-band radio waves resulting from large earthquakes, and its statistical relationship to magnitude of impending earthquakes

16. Wastewater Injection Spurred Biggest Earthquake Yet, Says Study

17. Inferring the Evolution of a Large Earthquake From Its Acoustic Impacts on the Ionosphere

18. Electromagnetic radiations associated with major earthquakes