This report presents a method for constructing a simplified numerical description of the electric current distributions in the ionosphere and gap region based on dipole-aligned loop elementary currents (DALECs). A theoretical basis for DALECs is presented, along with a prototypical algorithm for constructing an elementary numerical DALEC. The algorithm is verified and validated by combining DALECs with an efficient Biot-Savart solver in order to estimate magnetic disturbance on the Earth’s surface. We examine (1) simple scenarios with known solutions and (2) hemispherical magnetic disturbance fields obtained from a state-of-the-art global geospace circulation model.
Citation Information
Publication Year | 2022 |
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Title | Synthesizing ground magnetic disturbance using dipole-aligned loop elementary currents and Biot-Savart relationship |
DOI | 10.3133/sir20215123 |
Authors | E. Joshua Rigler, Michael Wiltberger |
Publication Type | Report |
Publication Subtype | USGS Numbered Series |
Series Title | Scientific Investigations Report |
Series Number | 2021-5123 |
Index ID | sir20215123 |
Record Source | USGS Publications Warehouse |
USGS Organization | Geologic Hazards Science Center |