Short period variations in the N2+ (0, 0) auroral emission band represent 5 per cent of the total light in the 3914 A region. These quasi-periodic coruscations have a dominant period of 6 to 10 seconds. They attain a maximum amplitude in the predawn hours and are closely related to magnetic field micropulsations and ionospheric absorption of cosmic noise. Spectroscopic triangulation showed that the variations originate in the E region of the ionosphere. The profile of the electron density associated with the aurora was found to have a maximum value of 1.1×104 electrons per cubic centimeter at 98 kilometers.
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Campbell et al. (1961) studied this question.
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