The Sura Ionospheric Heating Facility, located about 150 km from Nizhniy Novgorod, Russia, is capable of radiating about 300 mega-Watts (MW), effective radiated power (ERP). Area - Total 260,000 mi² Population - City (2003) - Metropolitan 1,334,249 2 million approx. ... This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... In radio telecommunications, effective radiated power or ERP is determined by subtracting system losses from system gains. ...
It is said that the project is similar to numerous existing ionospheric heaters around the world, and has a large suite of diagnostic instruments that facilitate its use to increase scientific understanding of ionospheric dynamics.
The Ionospheric Research Instrument (IRI) is the primary instrument at HAARP, which is a high-frequency (HF) transmitter system used to temporarily modify the ionosphere.
Ionosphericheating experiments performed at the Arecibo Observatory's ionospheric heater and incoherent scatter radar have shown that after periods of modification (up to an hour), the ionosphere returns to normal within about the same period of time it had been heated.
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