[1] Ruhr Univ Bochum, Inst Theoret Phys 4, Fak Phys & Astron, D-44780 Bochum, Germany
[2] Suez Canal Univ, Fac Educ Port Said, Dept Phys, Ismailia, Egypt
[3] Ruhr Univ Bochum, Nonlinear Phys Ctr, D-44780 Bochum, Germany
[4] Ruhr Univ Bochum, Ctr Plasma Sci & Astrophys, D-44780 Bochum, Germany
[5] Umea Univ, Dept Phys, SE-90187 Umea, Sweden
[6] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany
[7] Inst Super Tecn, GoLP, P-1049001 Lisbon, Portugal
[8] Ctr Fundamental Phys, Rutherford Appleton Lab, CCLRC, Didcot 0X11 0QX, Oxon, England
[9] Univ Strathclyde, SUPA Dept Phys, Glasgow G 40NG, Lanark, Scotland
[10] Univ Kwazulu Natal, Fac Sci & Agr, Sch Phys, ZA-4000 Durban, South Africa
[11] CITT, Dept Phys, Islamabad, Pakistan