Modeling and forecasting geomagnetically induced currents in Hokkaido, Japan

Details Modeling and forecasting geomagnetically induced currents in Hokkaido, Japan Modeling and forecasting geomagnetically induced currents in Hokkaido, Japan

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm54a..04p&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM54A-04

Mathematics

Logic

[7904] Space Weather / Geomagnetically Induced Currents, [7959] Space Weather / Models

Scientific paper

Geomagnetically induced currents (GIC) are the end link of the complex chain of interacting physical processes extending from the solar surface down to the upper mantle of the Earth. Modeling and forecasting GIC at complex geological situations at mid-latitudes where standard global MHD-based modeling approaches cannot be used directly is an especially challenging task. In this paper a novel model for computing geomagnetically induced currents (GIC) from local geomagnetic field observations carried out at mid-latitude location in Hokkaido, Japan is constructed. Statistical occurrence of GIC is computed using the constructed model and geomagnetic field recordings covering years 1986-2008. The modeled GIC is used to generate a list of ten largest GIC events in Hokkaido, Japan. It is found that the ten largest events between 1986-2008 were associated with various phases of coronal mass ejection driven major geomagnetic storms. The constructed one-dimensional ground conductivity model is interpreted in the context of the complex local geological setting and it is shown that the subduction zone dynamics likely play an important role in the observed GIC and geomagnetic field characteristics. Crustal conductor associated with the subduction zone is the cause for unusual direct relation between GIC and the local geomagnetic field (B) rather than its time derivative (dB/dt) and GIC. The implications of the new model for forecasting GIC in complex geological situations at mid-latitudes are discussed.

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