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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 2
Ann. Geophys., 27, 503–510, 2009
https://doi.org/10.5194/angeo-27-503-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 503–510, 2009
https://doi.org/10.5194/angeo-27-503-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  02 Feb 2009

02 Feb 2009

The persistence of equatorial spread F – an analysis on seasonal, solar activity and geomagnetic activity aspects

V. Sreeja, C. V. Devasia, Sudha Ravindran, and R. Sridharan V. Sreeja et al.
  • Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum-695022, India

Abstract. The persistence (duration) of Equatorial Spread F (ESF), which has significant impact on communication systems, is addressed. Its behavior during different seasons and geomagnetic activity levels under the solar maximum (2001) and minimum (2006) conditions, is reported using the data from the magnetic equatorial location of Trivandrum (8.5° N; 77° E; dip 0.5° N) in India. The study reveals that the persistence of the irregularities can be estimated to a reasonable extent by knowing the post sunset F region vertical drift velocity (Vz) and the magnetic activity index Kp. Any sort of advance information on the possible persistence of the ionospheric irregularities responsible for ESF is important for understanding the scintillation morphology, and the results which form the first step in this direction are presented and discussed.

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