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Remote oxygen sensing by ionospheric excitation (ROSIE)
Get PDFThe principal optical observable emission resulting from ionospheric
modification (IM) experiments is the atomic oxygen red line at 630 nm,
originating from the O(1D–3P) transition. Because the
O(1D) atom has a long radiative lifetime, it is sensitive to collisional
relaxation and an observed decay faster than the radiative rate can be
attributed to collisions with atmospheric species. In contrast to the common
practice of ignoring O-atoms in interpreting such observations in the past,
recent experimental studies on the relaxation of O(1D) by O(3P) have
revealed the dominant role of oxygen atoms in controlling the lifetime of
O(1D) at altitudes relevant to IM experiments. Using the most up-to-date
rate coefficients for collisional relaxation of O(1D) by O, N2, and
O2, it is now possible to analyze the red line decays observed in IM
experiments and thus probe the local ionospheric composition. In this
manner, we can demonstrate an approach to remotely detect O-atoms at the
altitudes relevant to IM experiments, which we call remote oxygen sensing by
ionospheric excitation (ROSIE). The results can be compared with atmospheric
models and used to study the temporal, seasonal, altitude and spatial
variation of ionospheric O-atom density in the vicinity of heating
facilities. We discuss the relevance to atmospheric observations and
ionospheric heating experiments and report an analysis of representative IM
data
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