The Force-freeness of the Solar Photosphere: Revisit with New Approach and Large Data Sets
Mei Zhang,
Haocheng Zhang
Abstract:Although it is generally believed that the solar photosphere is not magnetically force-free owing to its high plasma β, the estimations of force-freeness using observed magnetograms have produced disputable results. Some studies confirmed that the photosphere is largely not force-free whereas some authors argued that the photosphere is not far away from being force-free. In a previous paper of ours we demonstrated that, due to the fact that the noise levels of the transverse field in the magnetograms are much … Show more
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