Statistical Studies on Geomagnetically Induced Current Events Driven by Earth-directed Full Halo Coronal Mass Ejections

Details Statistical Studies on Geomagnetically Induced Current Events Driven by Earth-directed Full Halo Coronal Mass Ejections Statistical Studies on Geomagnetically Induced Current Events Driven by Earth-directed Full Halo Coronal Mass Ejections

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012acasn..53....9w&link_type=abstract

Acta Astronomica Sinica, vol. 53, no. 1, p. 9-27

Mathematics

Logic

Sun: Coronal Mass Ejections, Solar-Terrestrial Relations

Scientific paper

Solar activities and eruptions can cause the power transmission system to be an abnormal condition,especially for an extra-long distance electric power transmission system.We analyzed the coronal mass ejection (CME) data from SOHO/LASCO (Solar and Heliospheric Observatory/Large Angle and Spectrometric Coronagraph),and the geomagnetically induced current data and the geomagnetic storm data from North China Electric Power University and Finnish Meteorological Institute, respectively. After classifying the observed halo CMEs into three types according to their symmetry: complete symmetric, brightness asymmetric, and outline asymmetric. The geomagnetically induced current events that are driven by three different types of halo CMEs have different characteristics in intensity, duration and period.We found that the brightness asymmetric halo CMEs are most likely to cause the major damage to the transmission system.The geomagnetically induced current also has a good correlation to the time variation of the geomagnetic field.

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