ROSES ID: NNH19ZDA001N Selection Year: 2019
Program Element: Focused Science Topic
Principal Investigator: Yue Deng
Affiliation(s): University of Texas Arlington
Project Member(s):
Anderson, Brian J Co-I/Institutional PI Johns Hopkins University
Welling, Daniel Co-I University Of Texas, Arlington
Sheng, Cheng Co-I University Of Texas, Arlington
Morley, Steven K Co-I/Institutional PI Triad National Security, LLC
Summary:
Geomagnetically induced currents (GICs), which are strongly related to the change rate of geomagnetic field, pose a large hazard to the important infrastructures, such as powerlines and pipelines, especially during geomagnetic super storms. It is essential to understand the magne- tospheric and ionospheric processes responsible for the geomagnetic disturbances (GMD) during space weather events in order to improve the preparedness of society to the space weather impact. Recently significant progresses have been made in both observations and simulations to improve the description and understanding of GICs. A wide range of spacecraft and ground datasets has been utilized to analyze GICs and their correlation with drivers. Meanwhile, both first-principles physical models (MHD model coupled with ionosopheric electrodynamic model) and empirical models have been applied to the calculation of the geomagnetic perturbations. The ground con- ductivity model, which plays a crucial role to estimate the geoelectric field from geomagnetic disturbance (GMD), has been improved from 1-D to 3-D. However, a comprehensive understand- ing of the impact of different processes on the multi-scale geomagnetic disturbances is lacking, yet it remains fundamental to correctly interpret and specify GICs. Further, it is clear that small spa- tial scale magnetic perturbations with large amplitudes are a contributor to the GIC problem, but the underlying physics of these localized effects remains unclear [Ngwira and Pulkkinen, 2019]. The goal of this project is to examine the relative significance of different forcing terms in driving the multi-scale variations of geomagnetic disturbances through magnetosphere-ionosphere coupled simulations. Specifically, we will address the following three science questions (SQ):Performance Year | Reference | Actions |
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3 | Sheng, C., Deng, Y., Welling, D. T., & Morley, Ground Ma... | |
3 | Welling, D., Space Weather Modeling for Solar Tsunamis: Simu... | |
3 | Deng Y., M. Li, D. Welling, Q. Zhu, S. Mrak, Simulation of D... |