Table II. Artificial and Natural [[spi:math]] (2500-5500 [[spi:math]]) Auroral Intensities. Altitude I1 (Rayleighs) 12 (Rayleighs) Natural (Rayleighs) 350 1.24 1.58 x 106 - 300 1.30 1.65 x 106 - 250* 2.50* 3.17 x 106* - 200 6.5 8.25 x 106 150** 24.4 3.1 x 107 1.5 x 105** *Ar+ + O scattered charge exchange altitude. Below this altitude, and the calculated intensities are not accurate. the Ar+ beam becomes X XElectrons of energy (1-10) keV penetrates much deeper than Ar+ of 3.5 keV and generates aurora in this region and below. 38 *Ar +0 the Ar+
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