SA31D-2368
Large Scale Ionospheric Response During March 17, 2013 Geomagnetic Storm: Reanalysis Based on Multiple Satellites Observations and TIEGCM Simulations
Wednesday, 16 December 2015
Poster Hall (Moscone South)
Xinan Yue1, Wenbin Wang2, William Steven Schreiner3, Ying-Hwa Kuo3, Jiuhou Lei2, Jing Liu2, Alan Geoffrey Burns2, Yongliang Zhang4 and Shunrong Zhang5, (1)UCAR, Boulder, CO, United States, (2)High Altitude Observatory, Boulder, CO, United States, (3)University Corporation for Atmospheric Research, Boulder, CO, United States, (4)The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States, (5)MIT Haystack Observatory, Westford, MA, United States
Abstract:
Based on slant total electron content (TEC) observations made by ~10 satellites and ~450 ground IGS GNSS stations, we constructed a 4-D ionospheric electron density reanalysis during the March 17, 2013 geomagnetic storm. Four main large-scale ionospheric disturbances are identified from reanalysis: (1) The positive storm during the initial phase; (2) The SED (storm enhanced density) structure in both northern and southern hemisphere; (3) The large positive storm in main phase; (4) The significant negative storm in middle and low latitude during recovery phase. We then run the NCAR-TIEGCM model with Heelis electric potential empirical model as polar input. The TIEGCM can reproduce 3 of 4 large-scale structures (except SED) very well. We then further analyzed the altitudinal variations of these large-scale disturbances and found several interesting things, such as the altitude variation of SED, the rotation of positive/negative storm phase with local time. Those structures could not be identified clearly by traditional used data sources, which either has no gloval coverage or no vertical resolution. The drivers such as neutral wind/density and electric field from TIEGCM simulations are also analyzed to self-consistantly explain the identified disturbance features.
