Volume 41 Issue 6
Nov.  2021
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Article Navigation >  Chinese Journal of Space Science  > 2021  >  41(6): 887-897
OU Ming, WU Jiayan, CHEN Longjiang, ZHEN Weimin. Global Ionospheric TEC and ROTI Variations during a Moderate Geomagnetic Storm[J]. Chinese Journal of Space Science, 2021, 41(6): 887-897. doi: 10.11728/cjss2021.06.887
Citation: OU Ming, WU Jiayan, CHEN Longjiang, ZHEN Weimin. Global Ionospheric TEC and ROTI Variations during a Moderate Geomagnetic Storm[J]. Chinese Journal of Space Science, 2021, 41(6): 887-897. doi: 10.11728/cjss2021.06.887
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Global Ionospheric TEC and ROTI Variations during a Moderate Geomagnetic Storm

doi: 10.11728/cjss2021.06.887 cstr: 32142.14.cjss2021.06.887

  • China Research Institute of Radiowave Propagation, Qingdao 266107

  • Received Date: 2020-08-15
  • Rev Recd Date: 2021-05-31
  • Publish Date: 2021-11-15
    Abstract
  • The ionosphere will have strong disturbances on geomagnetic storm days. The physical mechanism causing an ionospheric disturbance is very complex, various dynamics and electrodynamics processes in magnetosphere/thermosphere lead to great differences in ionospheric morphology and response in different locations and different time during a geomagnetic storm. Therefore, the geomagnetic storm has always been a hot and difficult issue in ionospheric research. In August 2014, under the influence of a solar flare explosion and two CME events, a strong magnetic storm was triggered on 27 August, accompanied by an ionospheric storm effect. The maximum Kp index reached 4.7, and the lowest Dst index reached -80 nT, reaching the level of moderate intensity geomagnetic storm. Based on the data of global ionospheric TEC and Rate of TEC Index (ROTI), the global ionospheric effects at different sectors in August 2014 were analyzed. Possible mechanisms responsible for ionospheric disturbances were also discussed. It is found that the ionosphere in the geomagnetic storm has an obvious ionospheric storm effect. During the magnetic storm, the southern hemisphere was dominated by positive storms while the northern hemisphere was characterized by a positive storm followed by a long duration strong negative storm, and the negative phase storm duration was significantly longer than the positive storm; the amplitude variation at low latitude was smaller than that at mid-latitude and the high latitude mainly performed negative storm effects; the peaks of Equatorial Ionospheric Anomaly (EIA) disappeared after the magnetic storm occurs due to the movement of EIA towards the equator. The analysis of ionospheric irregularities during geomagnetic storms shows that ionospheric scintillation occurs before the magnetic storm at European-African sector and disappears after the geomagnetic storm. The results show that there are obvious temporal and spatial differences in the ionospheric changes during the storm.

     

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