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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 7
Ann. Geophys., 23, 2449–2456, 2005
https://doi.org/10.5194/angeo-23-2449-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 2449–2456, 2005
https://doi.org/10.5194/angeo-23-2449-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  14 Oct 2005

14 Oct 2005

Observations in equatorial anomaly region of total electron content enhancements and depletions

N. Dashora and R. Pandey N. Dashora and R. Pandey
  • Department of Physics, M. L. S. University, Udaipur 313 001, India

Abstract. A GSV 4004A GPS receiver has been operational near the crest of the equatorial anomaly at Udaipur, India for some time now. The receiver provides the line-of-sight total electron content (TEC), the phase and amplitude scintillation index, σφ and S4, respectively. This paper presents the first results on the nighttime TEC depletions associated with the equatorial spread F in the Indian zone. The TEC depletions are found to be very well correlated with the increased S4 index. A new feature of low-latitude TEC is also reported, concerning the observation of isolated and localized TEC enhancements in the nighttime low-latitude ionosphere. The TEC enhancements are not correlated with the S4 index. The TEC enhancements have also been observed along with the TEC depletions. The TEC enhancements have been interpreted as the manifestation of the plasma density enhancements reported by Le et al. (2003).

Keywords. Ionosphere (Equatorial ionosphere; Ionospheric irregularities)

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