via the ARRL: SSTV Goes Very High Profile

In late September, University of Alaska-Fairbanks researcher Chris Fallen, KL3WX, was attempting to produce an RF-induced airglow — or artificial aurora — using the High Frequency Active Auroral Research Program (HAARP) facility near Gakona, Alaska, to warm up the atmosphere. Clouds hampered his experiment, but Fallen alerted his Twitter followers that he also had embedded a few Slow-Scan Television (SSTV) frames in the powerful HAARP signal, which were copied in British Columbia and in Colorado.

“The SSTV images, aside from being a fun way to engage hams in some of the ionosphere-heating science performed at HAARP, will be useful for understanding radio propagation from Arctic or high-latitude sources,” Fallen told ARRL.

HAARP consists of multiple transmitters feeding 180 phased-arrays and is capable of producing 3.6 MW (that’s megawatts) of RF. HAARP’s signal is essentially aimed straight up.

via American Radio Relay League | Ham Radio Association and Resources