Magnetic outbreak associated with exploding granulations

Abstract

Diagnosing the spatial-temporal pattern of magnetic flux on the Sun is vital for understanding the origin of solar magnetism and activity. Here, we report a new form of flux appearance, magnetic outbreak, using observations with an extremely high spatial resolution of 0.16 arcsec from the 1.6-m Goode Solar Telescope (GST) at the Big Bear Solar Observatory. Magnetic outbreak refers to an early growth of unipolar magnetic flux and its later explosion into fragments, in association with plasma upflow and exploding granulations; each individual fragment has flux of 10${}^{16}$-10${}^{17}$ Mx, moving apart with velocity of 0.5-2.2 km/s. The magnetic outbreak takes place in the hecto-Gauss region of pore moats. In this study, we identify six events of magnetic outbreak during 6-hour observations over an approximate 40$\times$40 arcsec${}^2$ field of view. The newly discovered magnetic outbreak might be the first evidence of the long-anticipated convective blowup.

22 pages, 6 figures, accepted by ApJL

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Cited by in corpus (1)

• Non-thermal Sources from Stereoscopic Hard X-ray and Earth-based Microwave Observations in a Data-Constrained Magnetohydrodynamic Simulation