IRI ve IONOLAB Toplam Elektron İçeriğinin Şiddetli Jeomanyetik Fırtınalara Tepkisinin Karşılaştırılması

Bu çalışmada 17 Mart ve 22-23 Haziran 2015 tarihlerinde meydana gelen şiddetli jeomanyetik fırtınalar süresince IRI (International Reference Ionosphere) and IONOLAB (Ionosphere Research Laboratory)’dan elde edilen Toplam Elektron İçeriği (TEC) değerleri karşılaştırıldı. Bir jeomanyetik fırtına solar (Bz, Vp ve Np) ve jeomanyetik (Dst, Kp and Ap) indisler aracılığıla tanımlandı. TEC değerleri Türkiye’nin Ankara istasyonu için GPS-temelli IONOLAB tahmin yöntemi ve ampirik bir model olan IRI-2012 modeli aracılığıyla elde edildi. Araştırmanın sonucunda 17 Mart 2015 şiddetli jeomanyetik fırtınanın başlangıç ve ana fazı süresince IRI-2012 TEC değerleri (~ 38 TECU) değişmezken IONOLAB-TEC değerlerinin (~ 64 TECU) aynı süreçte önemli derecede artmıştır. 22-23 Haziran 2015 şiddetli jeomanyetik fırtınası süresince fırtınanın tüm fazlarında IONOLAB-TEC değerleri diğer fırtına ile karşılaştırıldığında daha az değişim gösterir. Her iki fırtına süresince IRI modelinin TEC değerlerini fırtınanın öncesinde genellikle daha düşük ve fırtınanın sonrasında daha yüksek tahmin ettiği görülmüştür. Sonuç olarak IONOLAB tahmin metodunun şiddetli jeomanyetik fırtına süresince orta enlemde bulunan Türkiye’nin Ankara istasyonu üzerinde meydana gelen tedirginliklere IRI modelinden daha duyarlı olduğu söylenebilir.

Anahtar Kelimeler:

Jeomanyetik fırtınalar, IRI-2012, IONOLAB, TEC

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