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Assessment of improvement of the IRI model for foF2 variability over three latitudes in different hemispheres during low and high solar activities

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dc.contributor.author Timoçin, Erdinç
dc.contributor.author Temuçin, Hüseyin
dc.contributor.author Inyurt, Samed
dc.contributor.author Shah, Munawar
dc.contributor.author Jamjareegulgarn, Punyawi
dc.date.accessioned 2022-03-22T11:44:17Z
dc.date.available 2022-03-22T11:44:17Z
dc.date.issued 2021-03
dc.identifier.citation Timoçin, Erdinç...at al. (2021). "Assessment of improvement of the IRI model for foF2 variability over three latitudes in different hemispheres during low and high solar activities", Acta Astronautica, Vol. 180, pp. 305-3016. tr_TR
dc.identifier.issn 0094-5765
dc.identifier.uri http://hdl.handle.net/20.500.12416/5167
dc.description.abstract This paper discusses the diurnal and seasonal variations of the F2 layer critical frequency (foF2) and the improvement of performance of the IRI-2016 model in predicting foF2 over three latitudes in different hemispheres during low and high solar activities. We extracted the foF2 data from six ionosonde stations which are Manila (14.7 degrees N, 121.1 degrees E), Yamagawa (31.2 degrees N, 130.6 degrees E), Yakutsk (62.0 degrees N,129.6 degrees E), Townsville (19.6 degrees S, 146.8 degrees E), Hobart (42.9 degrees S, 147.3 degrees E) and Terre Adelie (66.6 degrees S, 140.0 degrees E). The data of both low solar activity (LSA) period and high solar activity (HSA) periods were divided into three seasons as Northern Summer (May, June, July and August), Equinoxes (March, April, September and October) and Northern Winter (November, December, January and February). The present study showed that the IRI-2016 performance is strongly dependent on the solar activity, latitude, season, local time and hemisphere. For both hemispheres, the foF2 values at low latitude station are larger than those at middle latitude station, whereas the foF2 values at middle latitude station are larger than those at high latitude station. The agreement between IRI2016-modelled foF2 and foF2 measurements on all stations selected in the northern hemisphere is best for North Summer and worst for North Winter. For northern hemisphere, the values of relative deviations during both solar activities are largest in high latitudes and smallest in middle latitudes. As for southern hemisphere, the values of relative deviations during LSA are largest in middle latitudes and smallest in high latitudes, whereas the values of relative deviations during HSA are largest in low latitudes and smallest in high latitudes. It is thought that the relative deviations in the observed foF2 values are caused by solar activity that strongly alter chemical and electromagnetic processes in the ionosphere. These results are important for future improvements depending on solar activity and seasons in the IRI model for foF2 values over three latitudes in different hemispheres. tr_TR
dc.language.iso eng tr_TR
dc.relation.isversionof 10.1016/j.actaastro.2020.12.042 tr_TR
dc.rights info:eu-repo/semantics/closedAccess tr_TR
dc.subject International Reference Ionosphere (IRI-2016) tr_TR
dc.subject Ionosphere tr_TR
dc.subject F2 Layer Critical Frequency tr_TR
dc.subject Solar Activity tr_TR
dc.title Assessment of improvement of the IRI model for foF2 variability over three latitudes in different hemispheres during low and high solar activities tr_TR
dc.type article tr_TR
dc.relation.journal Acta Astronautica tr_TR
dc.contributor.authorID 182651 tr_TR
dc.identifier.volume 180 tr_TR
dc.identifier.startpage 305 tr_TR
dc.identifier.endpage 316 tr_TR
dc.contributor.department Çankaya Üniversitesi, Mühendislik Fakültesi, Yazılım Mühendisliği Bölümü tr_TR


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