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The magnetic field plays a key role in producing solar flares, so that theinvestigation on the relationship between the magnetic field properties andflares is significant. In this paper, based on the magnetic field extrapolatedfrom the photospheric vector magnetograms of the active region NOAA 9077obtained at Huairou Solar Observing Station, the magnetic field parametersincluding the height of field lines, force-free factor, free magnetic energyand inclination angle were studied with respect to an X-class flare in thisregion. We found that the magnetic field lines became lower and the ratio ofnumber of closed field lines to those of open field lines increased after theflare. The force-free factor ($\alpha$) attained a large value before the flareand then decreased after the flare for the closed field lines, while the openfield lines showed the opposite tendency. Free energy reach to maximum beforeflare, then decrease after flare. The magnetic inclination angles showedopposite change trends after the flare for closed and open field lines.Therefore, we may conclude that non-potential energy released by flare mostlycontained in the closed magnetic field lines.

Relationship between Magnetic Field Properties and an X-class Flare in Active Region NOAA 9077