SA035-0013
Persistence of the long-duration daytime TEC enhancements at different longitudinal sectors during the August 2018 geomagnetic storm

Wednesday, 16 December 2020
Poster
Qiaoling Li1, Fuqing Huang2, Jiahao Zhong1, Ruilong Zhang3, JiaWei Kuai4, Jiuhou Lei5, Libo Liu6, Dexin Ren7, Jiapeng Guo8, Han Ma9, Akimasa Yoshikawa10, Lianhuan Hu11 and Jun Cui12, (1)Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai, China, (2)University of Science and Technology of China, Hefei, China, (3)Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, (4)College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, China., Nanjing, China, (5)Univ. of Sci. & Tech. of Chin, Hefei, Anhui, China, (6)University of the Chinese Academy of Sciences, Beijing, China, (7)USTC, Hefei, China, (8)Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai, China., Planetary Environmental and Astrobiological Research Laboratory (PEARL), School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai, China., Zhuihai, China, (9)Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, (10)Kyushu University, Faculty of Science, Fukuoka, Japan, (11)Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China, Beijing, China, (12)Sun Yat-sen University, Zhuhai, China
Abstract:
In this study, the ionospheric responses around the Asian-Australian, American, and African sectors during the August 2018 geomagnetic storm were investigated based on the Beidou GEO satellite and MIT Madrigal total electron contents (TECs), combined with measurements from ionosondes, magnetometers, and Global Ultraviolet Imager (GUVI). The mid and low latitude TECs were dominated by positive responses over the three longitudinal sectors during the storm on August 26-29. It is unique that all TECs at the Asian-Australian, American, and African sectors displayed large daytime enhancements larger than 10 TECu on August 27-29, during the recovery phase, when the ionosphere is usually dominated by plasma depletions due to the ionospheric disturbance dynamo and/or disturbed thermospheric compositions. The combination and competition of the disturbed vertical plasma drifts through the solar wind-magnetosphere-ionosphere (SW-M-I) coupling, and disturbed neutral composition contribute significantly to the daytime TEC responses at different longitudinal sectors on August 26 during the main and early recovery phases. The eastward equatorial electrojet and O/N2 are larger than the quiet reference during the recovery phase on August 27-29, which suggest the enhanced upward vertical plasma drifts combined with higher O/N2 make an important contribution on the daytime positive ionospheric storm during the recovery phase. The enhanced vertical plasma drifts could not be driven by the SW-M-I coupling or ionospheric disturbance dynamo associated with geomagnetic storm. Further studies should be untaken to explore the dominant sources for the enhanced upward vertical drifts during the recovery phase.
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