Browsing by Author "Başçiftçi, F."

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Citation - WoS: 19
Citation - Scopus: 16
Investigation of Ionospheric Tec Changes Potentially Related To Seferihisar-Izmir Earthquake (30 October 2020, M-W 6.6)
(Ist Nazionale Di Oceanografia E Di Geofisica, 2022) Başçiftçi, F.; Bülbül, Sercan
It is important to be able to predict the occurrence time of an earthquake in order to take measures against its destructive effects. One of the parameters to be considered in earthquake prediction is ionospheric changes. Numerous studies have shown some changes in the ionosphere layer before or after the earthquake. These changes can be modelled to be detected with different methods and devices. One of the main parameters in examining these methods is the change of the Total Electron Content (TEC). With Global Navigation Satellite Systems (GNSS) observations, the TEC changes in the ionosphere can be determined before, during and after the earthquake. In this study, the changes in the ionosphere caused by the Seferihisar-Izmir earthquake (37.8881?? N 26.7770?? E, 30 October 2020, MW 6.6) were investigated in a 58-day time interval, including pre-earthquake, earthquake day, and post-earthquake. Firstly, the indices of solar activity (F10.7), Geomagnetic Activity (Dst), and Geomagnetic Storm (Kp) that can affect the ionosphere change pre-earthquake, earthquake day, and post-earthquake were examined. Then, the effects of the earthquake on the TEC changes in the ionosphere were investigated with the TEC values obtained from the regional ionospheric TEC (RIM-TEC), obtained from GNSS receivers in the earthquake zone and its surroundings, and global TEC maps (CODE). The indices showed that there were no geomagnetic activities between 29 September and 25 November 2020. In the study carried out, it was concluded that it is more accurate to calculate TEC values regionally rather than from Global TEC maps in the case of major episodic effects such as earthquakes. In addition, in the results about the TEC anomaly, it would seem that there was a maximum anomaly 8 days before the 304th day of 2020.
Citation - WoS: 8
Citation - Scopus: 8
Statistical Analysis of the Regional and Global Ionosphere Model on Intense Geomagnetic Storm
(Indian Assoc Cultivation Science, 2023) Başçiftçi, F.; Bulbul, S.
This study evaluated an intense geomagnetic storm two days before, on the day of the magnetic storm (26 August 2018), and two days after, for a total of 5-daily global navigation satellite system (GNSS) measurements. The assessments were carried out for eight continuously operation reference stations-Turkey (CORS-TR) stations located in the province of Konya, Turkey. The change in the ionosphere layer caused by the geomagnetic storm was analyzed in terms of the total electron content (TEC) values. The analysis revealed that positive and negative anomalies had occurred on the day of the magnetic storm, the day before, and the day after. The statistic tests and correlation coefficient were calculated between regional and global ionosphere models. The global model that best fit the regional model was determined by comparing the regional values obtained from the GNSS measurements with the CODE, IRI-2016, and IRI-Plas. Besides, the geomagnetic storm, solar wind parameters (Bz, E, P, N, v), and geomagnetic activity indices (Dst, ap, Kp) were examined. As a result of the study, the global model that best fit the ionosphere model found using the regional TEC values was obtained using CODE TEC values. Moreover, the study demonstrated that magnetic storm-induced changes in the ionosphere could be detected using GNSS stations located in Turkey. Besides, the possible effects of the intense geomagnetic storm were propounded by the TEC anomalies.