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The problem of auroral NO+ concentration and the intensity of 1·27μ bands of O2

Authors:	SS Prasad DR Furman AES Green

Institution:	Department of Physics and Astronomy, University of Florida, Gainesville, Florida, U.S.A.

Abstract:	The problem of the theoretical computation of the emission intensities and ion composition in a weak aurora which has been preceded by a stronger event is examined. For this purpose a model auroral precipitation consisting of biexponential primaries is considered. The softer of the two components is brighter, and begins to decay after remaining steady for ten to fifteen minutes. The other, harder component starts to build up at that instant. Our results suggest that at least a part of the high $n(NO^{+}) n(O_{2}^{+}) or I (1·27 μ) I (3914 A ?)$ ratios could be attributed to the retention, by the atmosphere, of the memory of previous auroral precipitations. Thus, the serious energy paradox in the context of 1·27 μ intensity need not arise, and, in the context of the large NO⁺ density, it may perhaps be unnecessary to invoke any major conversion of O₂ to NO thus avoiding the associated energy problem.

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