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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 1
Ann. Geophys., 27, 313-318, 2009
https://doi.org/10.5194/angeo-27-313-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 313-318, 2009
https://doi.org/10.5194/angeo-27-313-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  19 Jan 2009

19 Jan 2009

Role of gravity wavelike seed perturbations on the triggering of ESF – a case study from unique dayglow observations

V. Sreeja, C. Vineeth, Tarun Kumar Pant, Sudha Ravindran, and R. Sridharan V. Sreeja et al.
  • Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum, 695022, India

Abstract. First observational evidence, from the Indian longitudes, for the presence of gravity wavelike perturbations with periods of 20–30 min, acting as probable seeds for Equatorial Spread F (ESF) irregularities is described. The study is based on the daytime optical measurements of the mesopause temperature and the intensity of the thermospheric O(1D) 630.0 nm dayglow emissions using the unique MultiWavelength Dayglow PhotoMeter from Trivandrum (8.5° N; 77° E; dip lat ~0.5° N), a dip equatorial station. Measurements during the equinoctial months of a solar maximum (2001) and a solar minimum year (2006) have been used in this study. It is shown that under identical background ionospheric conditions within a solar epoch, the power of the gravity waves have a deterministic role in the generation of ESF. The mesopause temperature simultaneously observed, indicate that possible source regions for these perturbations lie in the lower atmosphere.

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