The effect of the geomagnetic activity to the hourly variations of ionospheric foF2 values at low latitudes

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dc.authoridÜNAL, İbrahim/0000-0001-8497-4459
dc.authoridTimocin, Erdinc/0000-0002-3648-2035
dc.authorwosidÜNAL, İbrahim/ABH-5657-2020
dc.authorwosidTimocin, Erdinc/H-2855-2017
dc.contributor.authorTimocin, Erdinc
dc.contributor.authorYesil, Ali
dc.contributor.authorUnal, Ibrahim
dc.date.accessioned2024-08-04T20:39:51Z
dc.date.available2024-08-04T20:39:51Z
dc.date.issued2014
dc.departmentİnönü Üniversitesien_US
dc.description.abstractIn this study, the relationship between the hourly changes of the ionospheric critic frequency values of F2 layers in low latitudes and geomagnetic activity is examined by using statistical methods. The ionospheric critical frequency data has been taken from the Manila (121.1A degrees A E, 14.7A degrees A N) ionosonde station. In order to investigate the effect of sun activity on ionospheric critical frequency, the data of 1981 when the sun was active and of 1985 when the sun was less active has been used. According to the Granger causality test results, on 5 % significance level, a causality relationship from disturbance storm time (Dst) index values to ionospheric critical frequency values direction has been observed. However, a causality relationship from ionospheric critical frequency values to Dst values has not been observed. From the results of cause-and-effect analysis, it is evaluated that the effect of a shockwave occurring in geomagnetic activity on ionospheric critical frequency continues along 72 h, that is, geomagnetic activity has a long-term effect on ionospheric critical frequency. The response of ionospheric critical frequency to geomagnetic activity substantially depends on seasons. This response is more observed especially in equinox period when the sun is active and in winter months. The increase in geomagnetic activity causes ionospheric critical frequency to decrease in night hours and increase in day hours. The same relationship has not been observed exactly, though observed very little in winter months, for 1985 when the sun was less active.en_US
dc.identifier.doi10.1007/s12517-013-1108-x
dc.identifier.endpage4442en_US
dc.identifier.issn1866-7511
dc.identifier.issn1866-7538
dc.identifier.issue10en_US
dc.identifier.scopus2-s2.0-84907191893en_US
dc.identifier.scopusqualityN/Aen_US
dc.identifier.startpage4437en_US
dc.identifier.urihttps://doi.org/10.1007/s12517-013-1108-x
dc.identifier.urihttps://hdl.handle.net/11616/96551
dc.identifier.volume7en_US
dc.identifier.wosWOS:000342486600039en_US
dc.identifier.wosqualityQ3en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherSpringer Heidelbergen_US
dc.relation.ispartofArabian Journal of Geosciencesen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectIonospheric foF2en_US
dc.subjectDst indexen_US
dc.subjectGranger causality testen_US
dc.subjectImpulse-response analysisen_US
dc.subjectTime lagged regressionen_US
dc.titleThe effect of the geomagnetic activity to the hourly variations of ionospheric foF2 values at low latitudesen_US
dc.typeArticleen_US

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