Solar Storms and Cycles: Explored with SDO and Topology

Details Solar Storms and Cycles: Explored with SDO and Topology Solar Storms and Cycles: Explored with SDO and Topology

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640228l&link_type=abstract

American Astronomical Society, AAS Meeting #216, #402.28

Mathematics

Logic

Scientific paper

Most severe space weather effects are caused by strong solar storms. It is therefore important to try to understand what determine a severe solar storm and how they vary in number. Coronal loops play the role of building blocks of solar storms, such as coronal mass ejections (CMEs) and solar flares. CMEs have been related to large-scale trans-equatorial loops and solar flares with small-scale loop structures. SOHO observations of conditions below solar surface clearly show the connection between rotation, helicity, and high coronal magnetic activity. Helicity is also well-known to play an important role in the understanding of the solar cycle dynamo. Dynamical systems, modeling solar dynamo cycles, have been studied by us with topological methods such as Poincaré maps. Here, we present results about relationships between cycles and intensity. For future studies, HMI measurements will be use as input to dynamical systems. We model the evolution and deformation of coronal loops with mathematical braids. Examples of interesting solar events observed with TRACE and SOHO are discussed, such as triggering of magnetic reconfiguration by the rotation. Similar events studied with SDO data are planned to be presented at this meeting. It will be especially interesting to explore with SDO the rapid changes of the coronal loops and the braided structures.

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