Measuring Coronal Magnetic Twist Injected by Photospheric Rotation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields

Scientific paper

Measuring the twist of the coronal magnetic field is important for understanding and predicting solar flares. The studies of instabilities in the past decades suggest a relation between solar flares and instabilities, such as the external kink mode, driven by excessive twist. We study the buildup of twist in an emerging and rapidly rotating active region (AR 9002) using the technique developed by Malanushenko et al. (2009). This uses EUV coronal images, from TRACE, and line-of-sight magnetograms, from MDI, to infer properties of the coronal magnetic field, including its local twist parameter alpha. We find that the twist of AR 9002 does not change with time, while twist of emerging AR 9004 starts left handed and becomes, after 80 hours, right handed. We compare the change rate of twist for AR 9004 to the predicted rate given the simple model of braiding and spinning flux tube and demonstrate the general agreement of the two. We also characterize the coronal twist of the flux interconnecting the two regions which is produced through reconnection. This work was supported by NASA and NSF.

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