Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Relations Between Tilt Angles of Sunspot Groups and Cycle Properties

The purpose of this thesis is to measure selected parameters of sunspot groups that show regularity and to examine their relations with the general properties of the solar cycle. With this goal, solar photospheric white-light drawings of Kandilli Observatory of Boğaziçi University were analysed for the period [1986-2012]. The observations are based on a technique which involves drawings of sunspots over solar images projected onto scaled white papers. The positions and areas of umbral regions in sunspot groups, and therefore quantities such as group latitude and tilt angle were sensitively measured, using a computer code developed for this study. Statistical analyses were carried out, to explore the interrelationships and time variations of the measured quantities. In this way, properties such as cycle strength, mean tilt angle, mean latitude, butterfly diagram, and hemispheric asymmetry were investigated for the 22^nd and 23^rd cycles of solar activity, using the sunspot databases of Kandilli Observatory and Royal Greenwich Observatory / NOAA. The similarities and differences between the solar cycles considered and the previous cycles were revealed, such that a contribution to the existing literature has been provided.
ÖZDÖNMEZ Aykut
Tez Adı : Kataklismik Değişenlerin Galaktik Model Parametreleri

Danışman : Tansel AK

Anabilim Dalı : Astronomi ve Uzay Bilimleri

Programı : -

Mezuniyet Yılı : 2013

Tez Savunma Jürisi : Prof. Dr. Tansel AK

Prof. Dr. Türker ÖZKAN

Doç. Dr. Selçuk Bilir

Doç. Dr. Ömür Çakırlı

Yard. Doç. Esma Yaz