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Active regions near the recent solar-cycle minimum: Relation between plasma heating and electrical currents

Livshits, M. A.; Rudenko, G. V.; Grigor'eva, I. Yu. +1 more

Data on small active regions on the Sun collected over three years (2007-2009) are analyzed. Under very quiescent conditions (a low X-ray background level), the shapes of the coronal loops of some active regions correspond fairly well to the shapes of magnetic-field lines calculated in a potential approximation. This is true of several active regi…