O I 630.0-nm dayglow in the region of equatorial ionization anomaly - Temporal variability and its causative mechanism

Details O I 630.0-nm dayglow in the region of equatorial ionization anomaly - Temporal variability and its causative mechanism O I 630.0-nm dayglow in the region of equatorial ionization anomaly - Temporal variability and its causative mechanism

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9713715s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A9, Sept. 1, 1992, p. 13,715-13,721. Research supported by Depart

Physics

17

Atmospheric Ionization, Dayglow, Equatorial Atmosphere, Thermosphere, Electron-Ion Recombination, F Region, Ionospheric Electron Density

Scientific paper

Results of the continuous measurements of O I 630.0-nm dayglow from Mount Abu (20 deg 20 min N dip latitude), a station in the region of equatorial ionization anomaly (EIA) by means of a recently developed ground-based dayglow photometer are presented. The measurements on magnetically quiet and moderately active days reveal that there are strong noontime bite-outs in 630.0-nm intensities. The temporal variabilities in the intensities show a good correlation with those in electron densities in the lower F region over Ahmedabad (18 deg 23 min N dip latitude) with a time delay of 1 hour. Theoretical estimation of the intensities indicates that the dissociative recombination of O2(+) with ambient electrons is mainly responsible for the observed temporal variability in the dayglow emission. The time delay between the theoretically evaluated and the measured noontime bite-outs is discussed in the context of the development of the EIA.

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