Diurnal, annual and solar cycle variations of hydroxyl and sodium nightglow intensities in the Europe-Africa sector

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Scientific paper

Average diurnal variation patterns of the nightglow hydroxyl and sodium intensities are studied using data accumulated over several years by filter photometers at stations in the tropics, and north and south temperate latitudes. These average patterns are shown to depend upon season and latitude. They are compared with the frequencies with which various patterns actually occur, and it is shown that with increasing latitude the type of variation seen on a given night becomes less predictable. The sodium emission co-varies with the OH diurnally. The annual variations of OH and Na are presented and it is shown that the sodium in the southern hemisphere behaves like the sodium in the northern hemisphere displaced by six months. The annual OH variation does not exhibit this property. The OH intensity follows the solar activity cycle, but the sodium does not.

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