[ghsc-seminars] GHSC Seminar - TODAY, Tuesday, 3/12 @ 10am - Roman Leonhardt, Conrad Observatory, ZAMG

[Rigler, Erin (Josh)]

*Geomagnetically induced current in central Europe*

*Roman Leonhardt*
*Conrad Observatory, Zentralanstalt für Meteorologie und Geodynamik (ZAMG)*

Geomagnetically induced currents (GICs) in power systems, which can lead to
transformer damage over the short and the long term, are a result of space
weather events and geomagnetic variations. For a long time, only
high-latitude areas were considered to be at risk from these currents, but
recent studies show that considerable GICs also appear in midlatitude and
equatorial countries. Results from a GIC model are presented, using a
thin-sheet approach with detailed surface and subsurface conductivity
models to compute the induced geoelectric field. The results are compared
to measurements of direct currents in a transformer neutral and show very
good agreement for short-period variations such as geomagnetic storms. The
modelling of GICs from regionally varying geoelectric fields will be
discussed and shown to be an important factor contributing to overall model
accuracy. The Austrian power grid in central Europe is susceptible to large
GICs in the range of tens of amperes, particularly from strong geomagnetic
variations in the east–west direction.


*Tuesday, March 12th**, 2019*
*Presentation: 10-11a*
*m*
*  (Mountain Time)*
*USGS, 1711 Illinois Street, Golden, CO*
*Entry Level Seminar Room (204)*

*Note: Please arrive *~5 minutes early* and *bring photo ID* for
airport-style security measures now in place at the USGS building.

Thank you,
GHSC Seminar Committee

Ben
Mirus - bbmirus at usgs.gov
Josh Rigler - erigler at usgs.gov
Oliver Boyd - olboyd at usgs.gov <oboyd at usgs.gov>
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