Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke.129r&link_type=abstract
2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe
Astronomy and Astrophysics
Astrophysics
Scientific paper
This paper investigates variability of equatorial ionosphere using ground based geomagnetic field data of horizontal and vertical field intensities obtained during the IGY-Cooperation, at the equatorial station of Ibadan (07.22°N 03.58°E). The ionospheric current responsible for the magnetic field variations is inferred to rise from early morning and attained maximum at about local noon. The day time variation in the resultant solar quiet daily variations Sq in horizontal and vertical field intensities Sq(H) and Sq(Z), respectively, were generally greater than night time. The rising rate of the Sq(H) is generally greater than the decay rate. The rate of building up of the ionospheric Sq current is faster than its rate of decay after noon time maximum. The vertical drift in the ionospheric current is observed to have seasonal variation.
Joshua E. O.
Mamukuyomi A. I.
Rabiu Babatunde A.
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