Kara ve Havacılık Haberleşmeleri İle İlişkili İyonosferik HF Tahminleri Üzerine Jeomanyetik Etkiler

Yıl 2017, Cilt: 1 Sayı: 2, 120 - 127, 18.12.2017

ERDİNÇ Timoçin İbrahim Ünal

https://doi.org/10.30518/jav.341698

Öz

Bu çalışmada, 23. Güneş döngüsünün maksimumu boyunca orta
enlemlerde IRI-2016’nın foF2 tahminleri üzerine jeomanyetik fırtınaların etkisi
araştırılmıştır. Bunun için, 2000 yılı boyunca Roma ve Juliusruh iyonsonda
istasyonlarından alınan ve aynı konumlar için IRI-2016'dan hesaplanan saatlik
foF2 verileri kullanılmıştır. 3 saatlik gezegensel jeomanyetik aktivite indisi
(3h-K_p)
jeomanyetik aktivite göstergesi olarak kullanılmıştır. Jeomanyetik fırtınalı
dönemler boyunca IRI-2016’nın performansını test etmek için iyonsonda
istasyonlarından ölçülen gerçek foF2 verileri ve IRI-2016’dan hesaplanan
tahmini foF2 değerleri kullanılarak yüzdelik sapma değerleri hesaplanmıştır. Bu
analizler, ekinokslar (21 Mart, 23 Eylül) ve gündönümleri (21 Haziran, 21
Aralık) civarında jeomanyetik fırtınalı günler temel alınarak dört mevsim için
yapılmıştır. Analiz sonuçlarından, jeomanyetik fırtınalı dönemler boyunca
IRI-2016 foF2 tahminlerinin, iyonsonda istasyonlarından ölçülen gerçek foF2
değerlerinden büyük ölçüde saptığı ve bu sapmaların mevsimlere ve enlem
değerine bağlı olarak değiştiği tespit edilmiştir.

Anahtar Kelimeler

İyonosfer, Kritik frekans, IRI-2016, Jeomanyetik fırtınalar

Geomagnetic Effects on the Ionospheric HF Predictions Related to Ground and Aviation Communications

Öz

In this study, the
effect of geomagnetic storms on the IRI-2016 foF2 predictions is investigated at
middle latitudes during the maximum of the solar cycle 23. For this purpose, hourly foF2 data measured from the
ionosonde stations Rome
and Juliusruh for the year
2000 and hourly foF2 data calculated from IRI-2016 for the same locations and
year are used. Planetary geomagnetic activity "3h-Kp" indices are
used as a geomagnetic activity indicator. In order to test performance of the
IRI-2016 for disturbed geomagnetic conditions, the percentile deviations is
calculated using the estimated foF2 data from IRI-2016 and the real foF2 data
from the ionosonde stations during the geomagnetic storms. This analysis is
done for four seasons based on geomagnetic stormy days around equinoxes (March
21, September 23) and solstices (June 21, December 21). From these results, it
is found that IRI-2016 foF2 predictions deviate considerably from the real foF2
data the ionosonde stations during geomagnetic disturbed periods and this
deviations differ according to the seasons and latitude value.

Anahtar Kelimeler

Ionosphere, Critical frequency, IRI-2016, Geomagnetic storms, Percentile deviationIonosphere

Kaynakça

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