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Fig. 2 | Progress in Earth and Planetary Science

Fig. 2

From: Magnetohydrodynamics modeling of coronal magnetic field and solar eruptions based on the photospheric magnetic field

Fig. 2

Magnetic fields of the sun. a Full-disk image of a line-of-sight component of the solar magnetic field observed by SDO/HMI at 15:00 UT on 29 March 2014, which corresponds to 2.5 h before an X1.0-class flare. b The magnetic field lines in yellow are superimposed on a. The field lines are extrapolated under the approximated potential field. This figure is courtesy of Dr. D. Shiota (Shiota et al. 2012). c The active region, corresponding to the region marked by an arrow in b, is the region in which a sunspot with a strong magnetic field is concentrated. The field lines are plotted according to the NLFFF approximation, in which they accumulate the strong current density

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