Abstract Solar quiet daily (Sq) variation in the earth’s magnetic field along the East African meridian was studied using data of the H, D and Z components recorded with Magnetic Data Acquisition System of SERC. One year data recorded at ten African geomagnetic observatories was used in the analysis of worldwide solar quiet daily variation (Wsq). The study revealed that the focus of Sq (H) in the southern hemisphere lies at the boundary of low and middle latitude region. Noon-time enhancement of Sq (H) was generally noticed at all stations along the meridian, though it is latitudinal dependent in terms of magnitude as it reduces with distance from dip equator. In addition, night-time variations also occur in small magnitude along African meridian in Sq (H) and Sq (Z) which could be attributed to non-ionospheric sources. Semi-diurnal variation was noticed in Sq (D) at all stations except in AAB that is under the influence of electrojet current. Dusk sector calm condition of Sq (D) current was notice in some stations and the same condition was also noticed at dawn sector in some other stations. The usual sunrise maximum and sunset minimum for D component at stations north of dip equator as well as sunrise minimum and sunset maximum was found to increase with distance away from dip equator. Day-time perturbation of Sq current was noticed to be more pronounced in all the three field elements. Mass plots of annual mean hourly value show contrasting phase pattern about the focus in H element and the results of the variations at each region with the associated standard error. It was concluded from the result of correlation coefficients computed that different currents system flowing in opposite directions could be responsible for contrasting patterns.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Mean solar quiet daily variations in the earth’s magnetic field along East African longitudes


    Contributors:
    Bello, O.R. (author) / Rabiu, A.B. (author) / Yumoto, K. (author) / Yizengaw, E. (author)

    Published in:

    Advances in Space Research ; 54 , 3 ; 283-289


    Publication date :

    2013-01-01


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Equatorial Spread-F Occurrence Statistics in the American Longitudes: Diurnal, Seasonal and Solar Cycle Variations

    Abdu, M. A. / Sobral, J. H. A. / Batista, I. S. et al. | British Library Conference Proceedings | 1998



    Solar Active Longitudes and the Large Scale Structure of the Coronal Field

    Stewart, G. A. / Bravo, S. / COSPAR et al. | British Library Conference Proceedings | 1995