Volume 44 Issue 6
Dec.  2024
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Article Navigation >  Chinese Journal of Space Science  > 2024  >  44(6): 1021-1030 Open Access
YANG Yunzhen, LIU Lilong, MO Shilei, HAN Qinghong, ZHANG Yan, ZHANG Yali, CAO Wenpeng. Ionospheric TEC Variation in Guangxi and Surrounding during High and Low Solar Activity Years (in Chinese). Chinese Journal of Space Science, 2024, 44(6): 1021-1030 doi: 10.11728/cjss2024.06.2024-0002
Citation: YANG Yunzhen, LIU Lilong, MO Shilei, HAN Qinghong, ZHANG Yan, ZHANG Yali, CAO Wenpeng. Ionospheric TEC Variation in Guangxi and Surrounding during High and Low Solar Activity Years (in Chinese). Chinese Journal of Space Science, 2024, 44(6): 1021-1030 doi: 10.11728/cjss2024.06.2024-0002
shu

Ionospheric TEC Variation in Guangxi and Surrounding during High and Low Solar Activity Years

doi: 10.11728/cjss2024.06.2024-0002 cstr: 32142.14.cjss.2024-0002
  • 1.

    College of Resources and Environment, Beibu Gulf University, Qinzhou 535000

  • 2.

    College of Geomatics and Geoinformation, Guilin University of Technology, Guilin 541004

  • 3.

    Guangxi Key Laboratory of Spatial Information and Geomatics, Guilin 541004

  • 4.

    School of Geography and Information Engineering, China University of Geosciences (Wuhan), Wuhan 430078

  • Received Date: 2024-01-04
  • Rev Recd Date: 2024-04-01
    • Available Online: 2024-05-11
    Abstract
  • The ionospheric delay error is one of the important error sources that affect the high-precision positioning, navigation, and timing of Global Navigation Satellite System. Using the GIM (Global Ionospheric Map) data provided by CODE from 2000 to 2021 year, the temporal and spatial variation characteristics of ionospheric TEC is analyzed in Guangxi and its surrounding areas at different levels of solar activity in two solar activity cycles, including annual, seasonal, 2-hour, and 4-hour time scales. The result show that the numerical magnitude and variation characteristics of ionospheric TEC are influenced by the intensity of solar activity. The ionospheric TEC during the high solar activity years is significantly greater than that during the low solar activity years. The ionospheric TEC exhibits a “bimodal” pattern throughout the year. The seasonal average ionospheric TEC in spring and autumn is greater than that in summer and winter. The ionospheric TEC exhibits a “winter anomaly” during the high solar activity years, but only appears in parts of regions in certain time periods during the low solar activity years. On the spatial frequency domain, with 1° change in longitude from east to west, the variation of ionospheric TEC is mainly concentrated at –2～2 TECU and –1～1 TECU during the high solar activity years and low solar activity years, respectively. With 1° change in latitude from south to north, they are mainly concentrated at –3～1 TECU and –2～1 TECU during the high solar activity year and low solar activity year, respectively. Overall, the variation of ionospheric TEC in the latitude direction is larger than that in the longitude direction. On the time frequency domain, the ionospheric TEC variation increases with the increase of time interval. The 2-hour and 4-hour variations of the ionospheric TEC showed that a normal distribution, and they are mainly concentrated at –20～20 TECU and –40～40 TECU during the high solar activity years, respectively. But they are all concentrated at –20～20 TECU during the low solar activity years.

     

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