The correlation between the variation in ionospheric conductivity and that of the geomagnetic Sq field |
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| Institution: | 1. Department of Physics, Landmark University, P.M.B. 1001, Omu-Aran, Kwara State, Nigeria;2. Department of Physics, University of Ilorin, P.M.B. 1515, Ilorin, Nigeria;1. Shri Vishnu Engineering College for Women, Vishnupur, Bhimavaram, 534202, India;2. Indian Institute of Geomagnetism, Navi Mumbai, India;3. Institute of Space Science, National Central University, Chung-Li, 32054, Taiwan;1. National Atmospheric Research Laboratory (NARL), Gadanki, India;2. Department of Physics, Sri Venkateswara University, Tirupati, India;3. B1, CEEBROS, 47/20, IIIrd Main Road, Chennai, India;1. School of Information Science and Engineering, Hunan University, Changsha, 410082, China;2. College of Science, Hunan Agricultural University, Changsha, 410128, China |
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| Abstract: | Effects of the solar activity on the geomagnetic Sq field were studied by examining the correlation of the Sq amplitude in the Y-component with the sunspot number or height integrated Pedersen and Hall conductivities of the ionosphere at Kakioka, Chambon La Foret and Port Moresby for a period of 21 years. It was found that solar activity dependence of the Sq amplitude is almost explained by the effect of the local ionospheric conductivity if the month is fixed. That is, the solar activity dependence in each month is mainly caused by the local conductivity. However, the amplitude is clearly small in winter for the same conductivity value. This is probably due to the seasonal difference of the neutral winds driving ionospheric dynamo currents or to the magnetic effect of the field-aligned currents connecting both hemispheres driven by the asymmetric dynamo action in the ionosphere. |
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