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Suppression of Plasma Bubbles over South America under weak geomagnetic perturbations

Journal of Geodesy and Geoinformation Science 2023年第4期6卷 48-69页

作者： Xunzhe YIN Dongjie YUE Changzhi ZHAI Yutian CHEN Xiaoyun CHENG School of Earth Sciences and Engineering Hohai UniversityNanjing 210098China

During a long-term Equatorial Plasma Bubbles(EPBs)occurrence between October 2020 and March 2021,a significant EPB suppression event was identified on November 22 and the observations from multi-instrument have been utilized to investigate this ***-scale Observations of the Limb and Disk(GOLD)satellite observed prominent EPBs between 23:40 UT and 23:55 UT during the long-term occurrence ***,no dark stripes representing EPBs were observed on November 22,and the Equatorial Ionization Anomaly(EIA)structure remained *** Total Electron Content(TEC)maps show that these EPBs appeared in the region between 35°W and 65°W longitudes and the magnitudes of the TEC loss in EPBs regions were about 20 *** for 22 November,the S4 index was consistently greater than 0.6 throughout November,indicating significant ionospheric *** Rate Of TEC Index(ROTI)maps revealed that the spatial extent and intensity of EPBs increased after their suppression,and the EPBs were locally *** swarm electron density measurements indicated that the variation amplitudes of EPBs at 510 km altitude were approximately 3 to 5 times larger than that at 460 km *** impact region of EPBs at 510 km was between 15°S and 20°N latitudes,while at 460 km,it was between 0°and 17°N *** the period of EPB suppression,the average h’f at three ionosonde stations decreased by about 50 km,and the vertical drift velocity(V z)approached~0 m/s while it was more than 20 m/s during the long-term occurrence.

关键词： plasma bubble ionospheric scintillation weak geomagnetic perturbations

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