SA021-0015
Local Time Dependant Hemispheric Asymmetry of the Ionosphere During the September 7-8 2017 Storm: Multi-Instrument Observations

Monday, 14 December 2020
Poster
Zihan Wang1, Shasha Zou2, Jiaen Ren2, Ercha Aa3 and Lei Liu4, (1)University of Michigan Ann Arbor, Climate and Space Sciences and Engineering, Ann Arbor, MI, United States, (2)University of Michigan, Climate and Space Sciences and Engineering, Ann Arbor, MI, United States, (3)Chinese Academy of Sciences, National Space Science Center, Beijing, China, (4)Wuhan University, School of Geodesy and Geomatics, Wuhan, China
Abstract:
Strong hemispheric asymmetry of the Total Electron Content (TEC) was observed during the double-dip geomagnetic storm on Sep 7-8, 2017. During the early recovery phase following the first main phase, a clear local time dependent TEC asymmetry developed in the mid latitude: In the European and African sector, the Southern Hemisphere was in the ionospheric storm positive phase while the Northern Hemisphere was in the negative phase. In contrast, the ionospheric storm phase the East Asian and Australian sector was opposite to that in the European and African sector. Four selected digisondes within these areas provided the electron density profile (EDP) and further confirmed the TEC asymmetry was observed in the F-region density as well. The plasma drift from digisondes and O/N2 from Global UltraViolet Imager (GUVI) on Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics (TIMED) satellite were utilized to study the possible drivers of the asymmetry. Our analysis showed that the asymmetry can be explained by a combination of the asymmetries in thermospheric composition changes and vertical drift.
<< Previous Abstract | Next Abstract >>