The Potential Field Source Surface (PFSS) model is used to visualize the dynamic magnetic field of our Sun. It uses a combination of observed measurements of magnetic field strength and direction on the solar surface to understand how solar material moves. The twisting magnetic fields form the enormous coronal loops frequently observed on the surface of the Sun.
Source: http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=12104 (NASA Goddard)
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