Airglow measurements of possible changes in the ionosphere and middle atmosphere

Physics

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Scientific paper

A brief review of mechanisms for oxygen airglow excitation is presented in the light of predicted mesosphere and lower thermosphere changes for increased carbon dioxide and methane. From this it is concluded that airglow is extremely sensitive to global change. Possible airglow measurements are reviewed, and an assessment given of the potential for the detection of change. The primary problem in the determination of trends is shown to be the natural variability of airglow, for which the two main factors are solar variability, and dynamics. Examples of solar and dynamical influences are shown. Independent monitoring of the solar flux can in principle allow the separation of the solar influence, but the dynamical one is more difficult. One solution proposed is to make ground-based measurements around a zonal ring of fixed latitude, with longitude separations that are as equally spaced as possible. Such an observing system has now been initiated as a SCOSTEP project, with the name PSMOS, the Planetary Scale Mesopause Observing System. It is expected that PSMOS will make a significant contribution towards the determination of such trends.

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