This paper describes the use of the generation of extremely low frequency (ELF) from heating of the D region of the ionosphere at high latitudes to estimate the degree of electron density ionization of the D region. In particular, the heating facility near Fairbanks, Alaska, known as the high-power auroral simulation (HIPAS) facility was used in this work. The theory of electron density synthesis is described, results of actual data presented, and electron densities determined. A new future ionospheric measurement technique is discussed.
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