Yüksek-Frekanslı Yer Dönme Parametrelerinin IVS-CONT14 Kampanyasının Analizi ile Kestirimi ve IERS2010 Modeliile Karşılaştırılması

Year 2017, Volume: 17 Issue: 2, 628 - 637, 31.08.2017

Kamil Teke Mehmet Fikret Öcal

Abstract

Bu çalışmada, Uluslararası Çok Uzun Baz İnterferometrisi (VLBI) Jeodezi ve Astrometri Servisi (IVS) tarafından 6-21 Mayıs 2014 tarihleri arasında 6 kıtadaki 17 VLBI istasyonunun katılımıyla gerçekleştirilen 15 günlük sürekli VLBI oturumlarından (IVS-CONT14) elde edilen ölçülerin analiz edilmesi ile yüksek-frekanslı Yer dönme parametreleri kestirimi yapılmıştır. Kestirilen Yer dönme parametreleri ile Uluslararası Yer Dönme ve Referans Sistemleri Servisi (IERS) 2010 konvansiyonlarında önerilen, günlük ve yarı-günlük (yüksek-frekanslı) okyanus gel-gitleri kaynaklı Yer dönme değişim modeli (IERS2010 modeli) değerleri, spektral analiz ve tanımlayıcı istatistik yöntemleri ile karşılaştırılmıştır. Ayrıca, IERS2010 okyanus gelgitleri kaynaklı yüksek frekanslı Yer dönme modelindeki başlıca gelgitlerin sinüs ve kosinüs genlikleri kestirilmiş, Yer dönme ekseninin ileri-giden (prograde) ve geri-giden (retrograde) kutup gezinmesi hareketlerine etkileri hem model hem de kestirilen parametreler için fazör gösterimi üzerinden yorumlanmıştır. IERS2010 modelinden hesaplananve IVS-CONT14 ölçülerinden kestirilen yüksek frekanslı Yer dönme parametrelerinin genliklerinin 12 saat periyodunda iyi uyum gösterdiği belirlenmiştir.

Keywords

VLBI, Yüksek-frekanslı Yer dönme parametreleri, Okyanus gelgitleri, IVS-CONT14 oturumları

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