Characteristics of the solar corona on 1 July 2013 when the βγδ active region was located on the solar limb: a) electron density; b) magnetic field; c) plasma frequency; d) electron-cyclotron frequency; e) plasma frequency to electron-cyclotron frequency ratio and; f) Alfvén speed. The location of the active region on the limb (AR) is labelled in panel a).
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