Journal cover Journal topic
Annales Geophysicae Sun, Earth, planets, and planetary systems An interactive open-access journal of the European Geosciences Union
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
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).
Variability of TEC and improvement of performance of the IRI model over Ethiopia during the high solar activity phase
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 03:00 UT (06:00 LT) and attain their peak values (mostly in the time interval of 09:00–13:00 UT or 12:00–16:00 LT). 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 (00:00–03:00 UT or 03:00–06:00 LT). 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.
Citation: Asmare Tariku, Y.: Variability of TEC and improvement of performance of the IRI model over Ethiopia during the high solar activity phase, Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2018-48, in review, 2018.
Yekoye Asmare Tariku
Yekoye Asmare Tariku
Yekoye Asmare Tariku

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