Evidence on 2-4 day oscillations of the equatorial ionosphere h'F and mesospheric airglow emissions

Details Evidence on 2-4 day oscillations of the equatorial ionosphere h'F and mesospheric airglow emissions Evidence on 2-4 day oscillations of the equatorial ionosphere h'F and mesospheric airglow emissions

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3212102t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 12, CiteID L12102

Computer Science

Sound

8

Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Equatorial Ionosphere, Ionosphere: Ionosphere/Atmosphere Interactions (0335), Atmospheric Processes: Tides And Planetary Waves

Scientific paper

Equatorial ionospheric sounding has been carried out at São Luís (2.6°S, 44.2°W). The upper mesosphere-lower thermosphere (MLT) airglow OI5577, O2b(0,1) and OH(6,2) emissions and OH rotational temperature have been observed at Cariri airglow observatory (7.4°S, 36.5°W) within a distance of approximately 1000 km to the east of São Luís. Both observation sites are located in the equatorial region of South America. Spectral analyses of the ionospheric F-layer bottom height (h'F) and airglow emission intensity reveal that there are quasi 2- and 4-day period oscillations in their temporal variations. This might indicate that planetary scale oscillations, Rossby-gravity waves (or inertial-gravity waves) and Ultra Fast Kelvin waves, are present in the ionosphere. This is the first time that the planetary scale waves in the MLT region and in the ionosphere are discussed by airglow and ionospheric observations, respectively.

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