Abstract
Data showing the average diurnal variation of the 5577 Å (OI) airglow emission for Tonanzintla, Mexico; Huancayo, Peru; San Juan, Argentina, and Lwiro, Congo, are presented. It is found that the diurnal variation is quite different from that observed at temperate latitudes. Tonanzintla and Lwiro are characterized by a decline of intensity through most of the night with, possibly, a maximum superimposed at 2300 hours, Huancayo by a small decline in intensity during the first part of the night followed by increasing intensity during the latter half of the night and San Juan by a definite minimum in the middle of the night. The form of the diurnal variation is found to be statistically significant by the t-test. Comparison of the results for the different stations leads to the conclusion that the form of the diurnal variation is not a simple function of either the geographic or magnetic coordinates and that no definitive conclusions can be reached at the present time on the interpretation of this form.
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