Investigation of O I 557.7 nm and O I 630.0 nm nightglow intensity ratios during the occurrence of equatorial F-region plasma bubbles.

Details Investigation of O I 557.7 nm and O I 630.0 nm nightglow intensity ratios during the occurrence of equatorial F-region plasma bubbles. Investigation of O I 557.7 nm and O I 630.0 nm nightglow intensity ratios during the occurrence of equatorial F-region plasma bubbles.

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..929f&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, Vol. 57, No. 8, p. 929 - 932

Physics

7

Airglow: Oxygen Lines, Airglow: Earth Ionosphere

Scientific paper

It is well-known that, at equatorial and low-latitudes, the O I 557.7 nm emission emanates both from the mesosphere and F-region. Earlier investigations using, in general, ground-based simultaneous observations indicate that the contribution to the O I 557.7 nm emission from the F-region is about 20% of the F-region O I 630.0 nm emission. Both of these emissions are excited by the dissociative recombination process (O2++e→O*(1S,1D)+O) in the F-region. The nocturnal intensity variations of these emissions sometimes show large short-lived depletions, associated with the passage of equatorial spread-F plasma bubbles through the field of view of a photometer. Regular observations of these emissions have been carried out at Cachoeira Paulista (22.7°S, 45.0°W), Brazil, since 1973. The authors present and discuss simultaneous observations of these emissions, during periods of strong equatorial spread-F conditions, when both emissions show large intensity drop-outs. Twenty-five nights of measurements from Cachoeira Paulista have been analysed for the study, which indicate that the average ratio of the intensity depletions (ΔI 557.7 nm/ΔI 630 nm) is about 0.26±0.07 for F-region altitudes, and this component has a dependence on the height of the electron density profile.

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