Active region

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In solar physics and observation, an active region is a temporary feature in the Sun's atmosphere characterized by a strong and complex magnetic field. They are often associated with sunspots and are commonly the source of violent eruptions such as coronal mass ejections and solar flares.^[1] The number and location of active regions on the solar disk at any given time is dependent on the solar cycle.^{[2][3][4][5][6]}