1. Department of Physics, Quaid-i-Azam University, 45320 Islamabad, Pakistan
2. Plasma Physics Laboratory, Department of Physics, COMSATS Institute of Information Technology, 44000 Islamabad, Pakistan
3. Department of Physics, FBAS IIU, Islamabad, Pakistan
4. Department of Physics, Faculty of Science, Jazan University, 114 Jazan, Saudi Arabia