Observations of ionospheric TEC peaked structures from Global Ionosphere Maps
- 1National Center for High-performance Computing, National Applied Research Laboratories, Hsinchu, Taiwan. (tctsai@narlabs.org.tw)
- 2Department of Civil Engineering, National Chiao Tung University, Hsingchu, Taiwan.
- 3Department of Geoscience, National Taiwan University, Taipei, Taiwan.
- 4Institute of Earth Science, Academia Sinica, Nankang, Taipei, Taiwan.
- 5Institute of Space Science, National Central University, Jhongli, Taiwan.
The total electron content (TEC) data from Global Ionosphere Maps provide a global TEC map in the region between latitude 87.5°S to 87.5°N, and longitude 180°W to 180°E. The TEC data in geographic coordinates are first transformed into geomagnetic coordinates through Altitude-Adjusted Corrected Geomagnetic Model (AACGM). We then use 2-dimensional (longitudinal, 180°W-180°E and time, 10 days) Fourier transform (FT) of TEC variations along different geomagnetic latitude to obtain all wave modes in both UT (universal time) and LT (local time) frames for the period from November 18, 2002 to October 15, 2014. The summation of contributing wave modes at a given local time provides the longitudinal variation of the associated zonal waves. The phases of wave modes lead to a constructive or destructive interference of contributing zonal wave, which gives different structures at different local time. These local time structures include Weddell Sea Anomaly (WSA), Southern Atlantic Anomaly (SAA), and Four-peaked structure. The dependence of the peaked structures on latitudinal, seasonal, and solar activity is studied.
How to cite: Tsai, T.-C., Jhuang, H.-K., Lee, L.-C., and Ho, Y.-Y.: Observations of ionospheric TEC peaked structures from Global Ionosphere Maps, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-12283, https://doi.org/10.5194/egusphere-egu2020-12283, 2020
