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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 11
Ann. Geophys., 20, 1851–1855, 2002
https://doi.org/10.5194/angeo-20-1851-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 20, 1851–1855, 2002
https://doi.org/10.5194/angeo-20-1851-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Nov 2002

30 Nov 2002

Characterizations of the diurnal shapes of OI 630.0 nm dayglow intensity variations: inferences

D. Chakrabarty1, R. Sekar1, H. Chandra1, R. Narayanan1, B. M. Pathan2, and K. S. V. Subbarao3 D. Chakrabarty et al.
  • 1Physical Research Laboratory, Ahmedabad, 38 0009, India
  • 2Indian Institute of Geomagnetism, Kolaba, Mumbai, 400 005, India
  • 3Space Physics Laboratory,Vikram Sarabhai Space Centre, Thiruvananthapuram, 695 022, India
  • Correspondence to: D. Chakrabarty (dipu@prl.ernet.in)

Abstract. Measurements of OI 630.0 nm thermospheric dayglow emission by means of the Dayglow Photometer (DGP) at Mt. Abu (24.6° N, 73.7° E, dip lat 19.09° N), a station under the crest of Equatorial Ionization Anomaly (EIA), reveal day-to-day changes in the shapes of the diurnal profiles of dayglow intensity variations. These shapes have been characterized using the magnetometer data from equatorial and low-latitude stations. Substantial changes have been noticed in the shapes of the dayglow intensity variations between 10:00–15:00 IST (Indian Standard Time) during the days when normal and counter electrojet events are present over the equator. It is found that the width (the time span corresponding to 0.8 times the maximum dayglow intensity) of the diurnal profile has a linear relationship with the integrated electrojet strength. Occasional deviation from this linear relationship is attributed to the presence of substantial mean meridional wind.

Key words. Ionosphere (equatorial ionosphere; ionosphere – atmosphere interactions; ionospheric disturbances)

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