GPS TEC Variation Affected by the Interhemispheric Conjugate Auroral Activity on 21 September 2009

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.

Authors:

• W. Suparta
• M. A. Mohd. Ali
• M. S. Jit Singh
• B. Yatim
• T. Motoba
• N. Sato
• A. Kadokura
• G. Bjornsson

Keywords:

• Auroral activity
• GPS TEC
• Interhemispheric conjugate points
• Responses

References:

[1] Sato, N., T. Nagaoka, K. Hashimoto, and T. Saemundsson, 1998.
Conjugacy of isolated auroral arcs and nonconjugate auroral breakups. J.
Geophy. Res., vol. 103(11), pp. 641- 11,652, 1998.
[2] Sato, N., A. Kadokura, Y. Ebihara, H. Deguchi, and T. Saemundsson,
"Tracing geomagnetic conjugate points using exceptionally similar
synchronous auroras," Geophys. Res. Lett., vol. 32, L17109,
doi:10.1029/2005GL023710, 2005.
[3] Tsurutani, B. T., E. Echer, F. L. Guarnieri, and J. U. Kozyra, "CAWSES
November 7-8, 2004, Superstorm: Complex Solar and Interplanetary
Features in the Post Solar Maximum Phase," Geophys. Res. Lett., vol. 35,
L06S05, 2008.
[4] Motoba, T., K. Hosokawa, N. Sato, A. Kadokura, and G. Bjornsson,
"Varying interplanetary magnetic field By effects on interhemispheric
conjugate auroral features during a weak substorm," J. Geophys. Res.,
vol.115, A09210, doi:10.1029/2010JA015369, 2010.
[5] Hofmann-Wellenhof, B., H. Lichtenegger, and J. Collins, Global
Positioning System: Theory and Practice Springer Verlag: 5th revised
edition, 2001.
[6] Suparta, W., B. Yatim, and M.A. Mohd Ali, "Monitoring Characteristics
of Space Weather Over UKM Bangi Selangor using GPS Receivers,"
Sains Malaysia, vol. 38(4), pp. 463-471, 2009.