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Direct evidence that twisted flux tube emergence creates solar active regions View all abstracts by submitter

David MacTaggart   Submitted: 2021-11-16 06:37

The magnetic nature of the formation of solar active regions lies at the heart of understanding solar activity and, in particular, solar eruptions. A widespread model, used in many theoretical studies, simulations and the interpretation of observations, is that the basic structure of an active region is created by the emergence of a large tube of pre-twisted magnetic field. Despite plausible reasons and the availability of various proxies suggesting the accuracy of this model, there has not yet been a methodology that can clearly and directly identify the emergence of large pre-twisted magnetic flux tubes. Here, we present a clear signature of the emergence of pre-twisted magnetic flux tubes by investigating a robust topological quantity, called magnetic winding, in solar observations. This quantity detects the emerging magnetic topology despite the significant deformation experienced by the emerging magnetic field. Magnetic winding complements existing measures, such as magnetic helicity, by providing distinct information about field line topology, thus allowing for the direct identification of emerging twisted magnetic flux tubes.

Authors: MacTaggart, D, Prior, C, Raphaldini, B, Romano, P, Guglielmino, SL
Projects: None

Publication Status: Published in Nature Communications
Last Modified: 2021-11-17 13:12
Go to main E-Print page  On the evolution of a sub-C class flare: a showcase for the capabilities of the revamped Catania Solar Telescope  Numerical Simulation of a Fundamental Mechanism of Solar Eruption with Different Magnetic Flux Distributions  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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