Magnetic Energy
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The magnetic energy from the photospheric magnetic field
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The magnetic energy from the 3D field
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Mean Free Energy: 0.5 percent of
the mean linear force-free energy
The evolution of the magnetic energy of Active Region 8210 in time is estimated
for the photospheric data (top), the potential field (middle), and the
linear force free field (bottom). The dashed lines mark solar flares.