Long-term variations in oxygen green line emission over Kiso, Japan, from ground photometric observations using continuous wavelet transform

Details Long-term variations in oxygen green line emission over Kiso, Japan, from ground photometric observations using continuous wavelet transform Long-term variations in oxygen green line emission over Kiso, Japan, from ground photometric observations using continuous wavelet transform

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgrd..11319115d&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue D19, CiteID D19115

Physics

Geophysics

2

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Processes: Mesospheric Dynamics, Mathematical Geophysics: Wavelet Transform (3255, 4455), Atmospheric Processes: Tides And Planetary Waves

Scientific paper

An analysis of 16 years long ground based photometric data of the oxygen green line (557.7 nm) over a mid latitude station Kiso (35.79°N, 137.63°E) was made using the continuous wavelet transform. This analysis shows the presence of semiannual, annual, and quasi-biennial variations in the airglow emission, which show interannual as well as nocturnal variations. The semiannual component is present during certain epochs and absent at other times. Also, it is statistically significant at 2000 hours JST (UT+09:00 hrs) and weakens as the night progresses. This variation is similar to the variation seen in wind imaging interferometer (WINDII) satellite data and thermosphere-ionosphere-mesosphere-electrodynamics - global circulation model (TIME-GCM) model as well. The annual component is present during the entire epoch, but its amplitude shows a minimum during the midnight. In addition, a strong quasi-biennial component is also seen at 2000 and 0200 hours JST, the amplitude of which exceeds the semiannual component during certain epochs. This component was not detected in earlier studies using the same data. These variations in the oxygen airglow show the effect of tidal dynamics in the mesosphere and lower thermosphere.

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