Volume 43 Issue 2
Mar.  2023
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Article Navigation >  Chinese Journal of Space Science  > 2023  >  43(2): 241-250 Open Access
LIU Guoqi, LI Haoyu, XIE Chaodi, LIU Benyu, LIU Jin, LI Xiang, LIU Kui, LI Haotong. Analysis of Variation Characteristic of TEC at Kunming Region and Comparison with IRI-2020 during Descending Phase of Solar Activity (in Chinese). Chinese Journal of Space Science, 2023, 43(2): 241-250 doi: 10.11728/cjss2023.02.2022-0066
Citation: LIU Guoqi, LI Haoyu, XIE Chaodi, LIU Benyu, LIU Jin, LI Xiang, LIU Kui, LI Haotong. Analysis of Variation Characteristic of TEC at Kunming Region and Comparison with IRI-2020 during Descending Phase of Solar Activity (in Chinese). Chinese Journal of Space Science, 2023, 43(2): 241-250 doi: 10.11728/cjss2023.02.2022-0066
shu

Analysis of Variation Characteristic of TEC at Kunming Region and Comparison with IRI-2020 during Descending Phase of Solar Activity

doi: 10.11728/cjss2023.02.2022-0066 cstr: 32142.14.cjss2023.02.2022-0066

  • School of Earth Sciences, Yunnan University, Kunming 650500

  • Received Date: 2022-11-08
  • Rev Recd Date: 2022-12-28
    • Available Online: 2023-03-10
    Abstract
  • The variation characteristics of ionospheric Total Electron Content (TEC) recorded at the low latitude station, Kunming (24.7°N, 102.9°E, geomagnetic latitude 15.1°N) China, during the descending phase of solar activity in 2016－2019 and its comparison with the output by the latest version model of the International Reference Ionosphere (IRI-2020) have been studied and discussed in this paper. The results show that the TEC at Kunming has an obvious semi-annual anomaly, with the high values during the spring and autumn seasons while the low values during the summer and winter seasons. The diurnal variation of TEC is prominent with that the high value levels in daytime and the low value levels in nighttime, and the daily peak TEC at Kunming appears mainly between 06:30－08:00 UT (about 13:00－15:00 LT). The magnitudes of the average annual TEC decrease obviously as the solar activity weakens, with the values of 48, 33, 27 and 24 TECU during the year of 2016－2019, respectively. The correlation analysis results indicate that there is a significant correlation between the peak TEC and the F10.7, and with a correlation coefficient of 0.86 between the monthly value of peak TEC and F10.7, but shows weak correlation between the peak TEC and the Ap index during the descending phase of solar activity in 2016－2019. The comparative results reveal that the latest version of International Reference Ionosphere could simulate well the seasonal variation of TEC at Kunming. However, there is a big difference between the output value and the observed result. The values of the root mean square deviation from model prediction and observational results are mostly between 2～15 TECU, and the relative deviation percentage values are mainly between –85% and 50%, which manifest that the prediction accuracy of the model IRI-2020 still needs to be improved in the application of forecast.

     

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