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Global Positioning System Total Electron Content Variation over King Sejong Station in Antarctic under the Solar Minimum Condition Between 2005 and 2009

  • Chung, Jong-Kyun (Space Science Division, Korea Astronomy and Space Science Institute) ;
  • Jee, Geon-Hwa (Division of Polar Climate Research, Korea Polar Research Institute) ;
  • Lee, Chi-Na (Space Science Division, Korea Astronomy and Space Science Institute)
  • Received : 2011.11.15
  • Accepted : 2011.11.25
  • Published : 2011.12.15

Abstract

The total electron content (TEC) using global positioning system (GPS) is analyzed to see the characteristics of ionosphere over King Sejong station (KSJ, geographic latitude $62^{\circ}13'S$, longitude $58^{\circ}47'W$, corrected geomagnetic latitude $48^{\circ}S$) in Antarctic. The GPS operational ratio during the observational period between 2005 and 2009 is 90.1%. The annual variation of the daily mean TEC decreases from January 2005 to February 2009, but increase from the June 2009. In summer (December-February), the seasonal mean TEC values have the maximum of 26.2 ${\pm}$ 2.4 TEC unit (TECU) in 2005 and the minimum of 16.5 ${\pm}$ 2.8 TECU in 2009, and the annual differences decrease from 3.0 TECU (2005-2006) to 1.4 TECU (2008-2009). However, on November 2010, it significantly increases to 22.3 ${\pm}$ 2.8 TECU which is up to 5.8 TECU compared with 2009 in summer. In winter (June-August), the seasonal mean TEC slightly decreases from 13.7 ${\pm}$ 4.5 TECU in 2005 to 8.9 ${\pm}$ 0.6 TECU in 2008, and the annual difference is constantly about 1.6 TECU, and increases to 10.3 ${\pm}$ 1.8 TECU in 2009. The annual variations of diurnal amplitude show the seasonal features that are scattered in summer and the enhancements near equinoxes are apparent in the whole years. In contrast, the semidiurnal amplitudes show the disturbed annual peaks in winter and its enhancements near equinoxes are unapparent. The diurnal phases are not constant in winter and show near 12 local time (LT). The semidiurnal phases have a seasonal pattern between 00 LT and 06 LT. Consequently, the KSJ GPS TEC variations show the significant semidiurnal variation in summer from December to February under the solar minimum between 2005 and 2009. The feature is considered as the Weddell Sea anomaly of larger nighttime electron density than a daytime electron density that has been observed around the Antarctica peninsula.

Keywords

References

  1. Choi BK, Cho JH, Lee SJ, Estimation and analysis of GPS receiver differential code biases using KGN in Korean Peninsula, AdSpR, 47, 1590-1599 (2011). http://dx.doi.org/10.1016/j.asr.2010.12.021
  2. Horvarth I, A total electron content space weather study of the nighttime Weddell Sea Anomaly of 1996/1997 southern summer with TOPEX/Poseidon radar altimetry, JGR, 111, A12317 (2006). http://dx.doi.org/10.1029/2006JA011679
  3. Jee G, Burns AG, Kim Y-H, Wang W, Seasonal and solar activity variations of the Weddell Sea Anomaly observed in the TOPEX total electron content measurements, JGR, 114, A04307 (2009). http://dx.doi.org/10.1029/2008JA013801
  4. Jee G, Lee H-B, Kim YH, Chung J-K, Cho J, Assessment of GPS global ionosphere map (GIM) by comparison between CODE GIM and TOPEX/Jason TEC data: Ionospheric perspective, JGR, 115, A10319 (2010). http://dx.doi.org/ 10.1029/2010JA015432
  5. Kitamura N, Shinbori A, Nishimura Y, Ono T, Iizima M, et al., Seasonal variations of the electron density distribution in the polar region during geomagnetically quiet periods near solar maximum, JGR, 114, A01206 (2009). http://dx.doi.org/10.1029/2008JA013288
  6. Liu Z, Gao Y, Ionospheric TEC predictions over a local area GPS reference network, GPS Solut, 8, 23-29 (2004). http://dx.doi.org/10.1007/s10291-004-0082-x
  7. Nozawa S, Ogawa Y, Oyama S, Fujiwara H, Tsuda T, et al., Tidal waves in the polar lower thermosphere observed using the EISCAT long run data set obtained in September 2005, JGR, 115, A08312 (2010). http://dx.doi.org/ 10.1029/2009JA015237

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