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

Sridharan, R. ; Haider, S. A. ; Gurubaran, S. ; Sekar, R. ; Narayanan, R. (1992) O I 630.0-nm dayglow in the region of equatorial ionization anomaly: temporal variability and its causative mechanism Journal of Geophysical Research, 97 (A09). pp. 13715-13721. ISSN 0148-0227

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Official URL: http://www.agu.org/pubs/crossref/1992/92JA00674.sh...

Related URL: http://dx.doi.org/10.1029/92JA00674

Abstract

Results of the continuous measurements of O I 630.0-nm dayglow from Mount Abu (20° 20' 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° 23' 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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