North-south asymmetry in the ionospheric equatorial anomaly in the African and the West Asian regions produced by asymmetrical thermospheric winds |
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| Institution: | 1. Department of Physics, Olabisi Onabanjo University, P.M.B. 2002, Ago Iwoye, Ogun State, Nigeria;2. Space Weather Group, Department of Physical Sciences, Landmark University, P.M.B 1001, Omu-Aran, Kwara State, Nigeria;3. Department of Physics, University of Lagos, Akoka – Yaba, Lagos State, Nigeria;4. Department of Physics, University of Tasmania, Hobart, Australia;1. Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan, 32003, Taiwan;2. Department of Chemical Engineering and Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan, 70101, Taiwan;3. Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan, 70101, Taiwan;1. Department of Physics, Federal University Oye-Ekiti, Ekiti State, Nigeria;2. The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy;3. Institute of Scientific Research, Boston College, Boston, USA;1. Department of Physics, University of Lagos, Akoka, Yaba, Lagos, Nigeria;2. Institute of Maritime Studies, University of Lagos, Akoka, Yaba, Lagos, Nigeria;1. Centre for Atmospheric Studies, Dibrugarh University, India;2. Department of Physics, Dibrugarh University, India;3. Kohima Science College, India;4. Department of Physics, Mizoram University, India |
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| Abstract: | The effect of asymmetrical thermospheric winds on NmF2 at the dip I = 30° and its magnetic conjugate point have been computed for equinox conditions to study asymmetry in the ionospheric equatorial anomaly in the African and West Asian regions. The wind models of I11 et al. and Chan and Walker have been used in our computations. During the daytime, due to the winds NmF2 in the northern crest becomes greater than NmF2 in the southern crest; at night the reverse is true in both regions. It is shown that the observed asymmetry in NmF2 at the equatorial crest in the African sector can be well explained by considering the effects of asymmetrical winds with respect to those in the West Asian sector. |
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