S320p.44 — Comparison of solar active region complexity and geomagnetic activity from 1996 to 2014

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Aug 10th at 6:00 PM until 7:30 PM

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Author(s): Shabnam Nikbakhsh3, Eija Irene Tanskanen1, David Perez-Suarez2, Thomas Hackman3

Institution(s): 1. Finnish Meteorological Institute , 2. University College London, 3. University of Helsinki

We have studied the influence of magnetic complexity of solar Active Regions (ARs) on geomagnetic activity from 1996 to 2014. Sunspots are visual indicators of ARs where the solar magnetic field is concentrated. We have used the International and American sunspot numbers together with the ones provided by the Space Environment Service Center (SESC) and Space Weather Prediction Center (SWPC) to examine ARs. Major manifestations of solar explosive events, such as flares and Coronal Mass Ejections (CMEs), are associated with ARs. For this study we chose the Mount Wilson scheme. It classifies ARs in terms of their magnetic topology from the least complex (α) to the most complex one (βγδ). Several cases have been found where the more complex structures produce stronger flares and CMEs than the less complex ones. We have a list of identified substorms available with different phases and their duration. This will be compared to our magnetic complexity data to analyze the effects of ARs magnetic complexity to the magnetic activity on the vicinity of the Earth.