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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 28, issue 9
Ann. Geophys., 28, 1741–1747, 2010
https://doi.org/10.5194/angeo-28-1741-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 1741–1747, 2010
https://doi.org/10.5194/angeo-28-1741-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

ANGEO Communicates 24 Sep 2010

ANGEO Communicates | 24 Sep 2010

Features of the F3 layer occurrence over the equatorial location of Trivandrum

V. Sreeja, S. Ravindran, and T. K. Pant V. Sreeja et al.
  • Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum, India

Abstract. The general features of the F3 layer occurrence over the magnetic equatorial location of Trivandrum (8.5° N; 77° E; dip lat ~0.5° N) in India during the period from 1996–2005 are presented using the ionosonde observations. The study brings out that the F3 layer occurrence over Trivandrum is weak and rare compared to the other equatorial locations. The F3 layer occurrence is relatively more pronounced during the magnetically active conditions, thus indicating the dependence of the layer formation over Trivandrum on magnetic activity. It is also observed that the percentage occurrence of the F3 layer decreases with increasing solar activity.

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