%0 Journal Article %A W. Suparta and M. A. Mohd. Ali and M. S. Jit Singh and B. Yatim and T. Motoba and N. Sato and A. Kadokura and G. Bjornsson %D 2011 %J International Journal of Geological and Environmental Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 60, 2011 %T GPS TEC Variation Affected by the Interhemispheric Conjugate Auroral Activity on 21 September 2009 %U https://publications.waset.org/pdf/8568 %V 60 %X This paper observed the interhemispheric conjugate auroral activity occurred on 21 September 2009. The GPS derived ionospheric total electron content (TEC) during a weak substorm interval recorded at interhemispheric conjugate points at Husafell in Iceland and Syowa in Antarctica is investigated to look at their signatures on the auroral features. Selection of all-sky camera (ASC) images and keogram at Tjörnes and Syowa during the interval 00:47:54 – 00:50:14 UT on 21 September 2009 found that the auroral activity had exerted their influence on the GPS TEC as a consequence of varying interplanetary magnetic field (IMF) By polarity. %P 821 - 824