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Chinese Journal of Space Science ›› 2018, Vol. 38 ›› Issue (6): 855-861.doi: 10.11728/cjss2018.06.855

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Statistical Analysis of the Ionosphere Disturbance Based on the IGS Global Ionosphere TEC Map

HOU Weizhen1, ZHANG Shaocheng1, YIN Fei1, YU Tao2   

  1. 1. Faculty of Information Enginieering, China University of Geosciences, Wuhan 430074;
    2. Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074
  • Received:2017-05-18 Revised:2018-04-25 Online:2018-11-15 Published:2018-11-30

Abstract:

The ionospheric Total Electron Content (TEC) is an important parameter for space weather research and helps to understand the changes of space environment. In this paper, 18 years' IGS ionospheric TEC grid data from 1999 to 2016 are employed to calculate the ionosphere disturbance over four different areas, including high, middle, mid-low and low magnetic latitude. The thresholds of the ionosphere disturbance are selected according to the statistic results on different TEC grid point, and the relationship between ionosphere disturbance and other physical elements, such as solar activity, geomagnetic latitudes and geomagnetic activities, are studied. The results show that the ionosphere disturbances are closely related with the solar activities. The occurrence rate of TEC disturbance event's is about 1.79% at lower solar activity, while the rate increases to 10.18% at higher solar activity. The high latitude areas always have higher ionosphere disturbance rate than other areas. The correlation coefficient between TEC disturbance index of middle and mid-low magnetic latitude and geomagnetic index Ap are 0.57 and 0.56 respectively. The coefficients in high and low magnetic latitude are 0.44 and 0.39 respectively. There are different correlations between ionosphere disturbance of different areas and global geomagnetic index Ap, and using regional geomagnetic index could help improving the correlations between geomagnetic index and ionospheric disturbance.

Key words: Ionospheric Total Electronic Content (TEC), Ionospheric disturbance, Geomagnetic activity, Correlation analysis

CLC Number: