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Measurement of the coronal magnetic field is a crucial ingredient inunderstanding the nature of solar coronal dynamic phenomena at all scales. Weemploy STEREO/COR1 data obtained near maximum of solar activity in December2012 (Carrington rotation, CR 2131) to retrieve and analyze thethree-dimensional (3D) coronal electron density in the range of heights from$1.5$ to $4\ \mathrm{R}_\odot$ using a tomography method and qualitativelydeduce structures of the coronal magnetic field. The 3D electron densityanalysis is complemented by the 3D STEREO/EUVI emissivity in 195 \AA \ bandobtained by tomography for the same CR period. We find that the magnetic fieldconfiguration during CR 2131 has a tendency to become radially open atheliocentric distances below $\sim 2.5 \ \mathrm{R}_\odot$. We compared thereconstructed 3D coronal structures over the CR near the solar maximum to theone at deep solar minimum. Results of our 3D density reconstruction will helpto constrain solar coronal field models and test the accuracy of the magneticfield approximations for coronal modeling.

3D Global Coronal Density Structure and Associated Magnetic Field near Solar Maximum