The Platteville Atmospheric Observatory was one of the first major ionospheric heaters in the world. Operating from 1968 through 1984, it expanded knowledge of ionospheric processes greatly. The observatory continues operation, but now focuses on wind profiling. The first studies were made of HF heater induced air-glow, heater-induced spread F, wide band heater-induced absorption, and heater created field-aligned ionization. 1968 was a leap year starting on Monday (the link is to a full 1968 calendar). ... 1984 is a leap year starting on Sunday of the Gregorian calendar. ... The ionosphere is the part of the atmosphere that is ionized by solar radiation. ...
References to experiments and programs at Platteville (http://grison.colorado.edu/pao-lower/History/history_references.html)
One of the earliest ionospheric heating facilities was at Platteville, Colorado, capable of radiating about 100 MW ERP.
Ionospheric heating experiments performed at the Arecibo Observatory'sionospheric 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.
Contributions in the areas of interactions of internal gravity with mean flows by John Merrill and with topography by Karl Taylor during terms as visiting fellows laid the groundwork for subsequent boundary-layer theory projects.
One example from the late 1970s was related to the construction of the Boulder AtmosphericObservatory (BAO), an instrumented 300 meter tower near the town of Erie east of Boulder.
The legacy of early studies of atmospheric turbulence and its measurement at the "Boulder Tower" persists today in the innovative approaches to lower-atmosphere observing systems using kites and parachutes, pioneered by CIRES Fellow Ben Balsley.
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