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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/angeo-2018-48
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 05 Jun 2018

Regular paper | 05 Jun 2018

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This discussion paper is a preprint. It has been under review for the journal Annales Geophysicae (ANGEO). The manuscript was not accepted for further review after discussion.

Variability of TEC and improvement of performance of the IRI model over Ethiopia during the high solar activity phase

Yekoye Asmare Tariku Yekoye Asmare Tariku
  • Department of Space Science and Research Application Development, Ethiopian Space Science and Technology Institute, Addis Ababa, Ethiopia

Abstract. This paper discusses the monthly and seasonal variation of the total electron content (TEC) and the improvement of performance of the IRI model in estimating TEC over Ethiopia during the solar maximum (2013–2016) phase employing GPS TEC data inferred from the GPS receivers installed at different regions of Ethiopia. The results reveal that both the measured and modeled seasonal diurnal VTEC values start increasing at 03:00UT (06:00LT) and attain their peak values (mostly in the time interval of 09:00–13:00UT or 12:00–16:00LT). Moreover, both the arithmetic mean measured and modeled VTEC values, generally, show maximum and minimum values in the equinoctial and June solstice months, respectively. The results also show that, even though overestimation of the modeled VTEC has been observed on most of the hours, the model is generally good to estimate both the monthly and seasonal diurnal hourly VTEC values, especially in the early morning hours (00:00–03:00UT or 03:00–06:00LT). Moreover, the overall results show that using NeQuick option for the topside electron density is the best option in estimating the TEC variation. It has also been shown that the model does not show a good improvement on its performance in estimating both the monthly and seasonal hourly and arithmetic mean VTEC values. Moreover, the model does not respond to the effects resulting from storm.

Yekoye Asmare Tariku
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Yekoye Asmare Tariku
Yekoye Asmare Tariku
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Latest update: 21 Oct 2018
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