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Extrapolation codes for modelling the magnetic field in the corona incartesian geometry do not take the curvature of the Sun's surface into accountand can only be applied to relatively small areas, \textit{e.g.}, a singleactive region. We apply a method for nonlinear force-free coronal magneticfield modelling of photospheric vector magnetograms in spherical geometry whichallows us to study the connectivity between multi-active regions. We use vectormagnetograph data from the Synoptic Optical Long-term Investigations of the Sunsurvey (SOLIS)/Vector Spectromagnetograph(VSM) to model the coronal magneticfield, where we study three neighbouring magnetically connected active regions(ARs: 10987, 10988, 10989) observed on 28, 29, and 30 March 2008, respectively.We compare the magnetic field topologies and the magnetic energy densities andstudy the connectivities between the active regions(ARs). We have studied thetime evolution of magnetic field over the period of three days and found nomajor changes in topologies as there was no major eruption event. From thisstudy we have concluded that active regions are much more connectedmagnetically than the electric current.

Magnetic Connectivity between Active Regions 10987, 10988, and 10989 by Means of Nonlinear Force-Free Field Extrapolation