Diagnostic Analysis of the Physical Processes Underlying theLong-Duration O/N2 Depletion During the Recovery Phase ofthe 8 June 2019 Geomagnetic Storm
- 1Institute of Geology and Geophysics, Chinese Academy of Sciences,, Key Laboratory of Earth and Planetary Physics, China (ytt@mail.iggcas.ac.cn)
- 2Beijing National Observatory of Space Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
- 3College of Earth and Planetary Sciences, University of the Chinese Academy of Sciences, Beijing, China
- 4Heilongjiang Mohe Observatory of Geophysics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
- 5High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA
- 6Laboratory of Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, USA
- 7Independent Researcher, Kuehlungsborn, Germany
- 8School of Earth Sciences and Engineering, Hohai University, Nanjing, China
- 9Hunan Provincial Key Laboratory of Geo-Information Engineering in Surveying, Mapping and Remote Sensing, Hunan University of Science and Technology, Xiangtan, China
A thermospheric O and N2 column density ratio (ΣO/N2) depletion with long-duration (>16 hr) was observed by the Global-scale Observations of the Limb and Disk at the Atlantic longitudes (75W–20W) and middle latitudes (20N–50N) during the recovery phase of the 8 June 2019 geomagnetic storm. The National Center for Atmospheric Research Thermosphere Ionosphere Electrodynamics General Circulation Model (TIEGCM) simulations reproduced the ΣO/N2 depletion patterns with a similar magnitude, and indicated that the composition recovery at middle latitudes began several hours after the beginning of the recovery phase of the geomagnetic storm. The TIEGCM simulations enable quantitative analysis of the physical mechanisms driving the middle-latitude composition changes during the storm recovery phase. This analysis indicates that vertical advection and molecular diffusion dominated the initial recovery of composition perturbations at middle latitudes. Horizontal advection was also a main driver in the initial recovery of composition, but its contribution decreased rapidly. In the late recovery phase, the composition recovery was mainly determined by horizontal advection. In comparison, vertical advection and molecular diffusion played a much less important role.
How to cite: Yu, T., Wang, W., Ren, Z., Cai, X., Liu, L., He, M., Pedatella, N., and Zhai, C.: Diagnostic Analysis of the Physical Processes Underlying theLong-Duration O/N2 Depletion During the Recovery Phase ofthe 8 June 2019 Geomagnetic Storm, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-3722, https://doi.org/10.5194/egusphere-egu23-3722, 2023.
