Comments on the paper: Diurnal,annual and solar cycle variations of hydroxyl and sodium nightglow intensities in the Europe-Africa sector |
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| Authors: | G Moreels RL Gattinger AVallance Jones |
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| Institution: | Service d''Aéronomie, CNRS B.P. 3, 91370-Verrières le Buisson, France;Astrophysics Branch, National Research Council, Ottawa, Canada KIAOR8 |
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| Abstract: | Night-time variations of the OH nightglow intensity reported by Wiens and Weill are compared with the theoretical predictions of a number of models. The behaviour of this emission agrees better with the theoretical one for locations in the equatorial zone but becomes more variable and less predictable for mid-latitude stations. It is calculated that, as a result of an increase of the eddy diffusion coefficient K, the OH emission can deviate from the typical night-time variation and increase by a factor as high as 2 if K is multiplied by 10. It is suggested that the eddy diffusion coefficient in the upper atmosphere is lower and undergoes lower amplitude variations in the equatorial zone than in the mid-latitude regions. |
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