研究目的
to compare the GPS TEC measurements by stations of the American region located along the path of the total solar eclipse on August 21, 2017 with those from the days before and after the event.
研究成果
An unusual change in daily ionospheric vTEC was observed during the total eclipse by both GPS stations at North Carolina, USA and Amapá, Brazil. The maximum deviation of vTEC observed by both stations during the solar eclipse is about 7 to 8 TECU towards the umbral phase. The ionospheric density of electrons decreases during the eclipse period and it is restored to normal condition when the eclipse ends.
研究不足
The study is limited by the dependence of slant TEC on the ray path geometry through the ionosphere and the assumption of a thin shell model for the ionosphere. Additionally, the interpolation of satellite positions may introduce some inaccuracies.
1：Experimental Design and Method Selection:
The study utilized dual frequency GPS data to analyze the ionospheric TEC variability during the total solar eclipse. The methodology involved extracting absolute TEC from GPS observations, including the calculation of slant TEC and its conversion to vertical TEC (vTEC).
2：Sample Selection and Data Sources:
Data were collected from two GPS monitoring stations: North Carolina, USA (P779) and Amapá, Brazil (APS1), during the total solar eclipse on August 21, 2017, and the days immediately preceding and following it.
3：List of Experimental Equipment and Materials:
GPS receivers at the two monitoring stations, MATLAB for data processing, and GPS Precise Orbit Files from the International GNSS Service (IGS).
4：Experimental Procedures and Operational Workflow:
The process involved calculating slant TEC from GPS observations, removing instrumental biases to calibrate the TEC, and converting slant TEC to vTEC using a mapping function. The satellite positions were interpolated at every 30 seconds for precise calculations.
5：Data Analysis Methods:
The vTEC values were compared across the three days to assess the impact of the solar eclipse on ionospheric electron density.
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