1. Astrophysics Research Center, School of Mathematics Statistics and Computer Science University of KwaZulu‐Natal Private Bag X54001 Durban 4000 South Africa
2. Department of Mathematical and Physical Sciences College of Arts and Sciences University of Nizwa P.O. Box 33 Nizwa 616
3. Department of Physics Zhejiang Normal University Jinhua 321004 People's Republic of China
4. Department of Physics, College of Science Princess Nourah bint Abdulrahman University P.O. Box 84428 Riyadh 11671 Saudi Arabia
5. Department of Physics, College of Sciences University of Bisha P.O. Box 344 Bisha 61922 Saudi Arabia