Institution: | 1.Astronomy Dept., Faculty of Science,Cairo University,Cairo,Egypt;2.Physics Dept., College of Sciences and Humanities, Hawtat Sudair,Majmaah University,Majmaah,Saudi Arabia;3.Astronomy Dept.,National Research Institute of Astronomy and Geophysics (NRIAG),Cairo,Egypt;4.Physics Dept., Faculty of Science,Northern Border University,Arar,Saudi Arabia;5.King Abdul Aziz university,Jeddah,Saudi Arabia |