The relationship between the nonpotential parameters and flare eruptions of solar active region NOAA11283

摘要

We investigated the variation of magnetic helicity injection through the photospheric surface of the flare-productive active region 11283 during 5 days. The helicity injection was determined using line-of-sight magnetograms with 12- minute cadence taken by the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO). We found that a mount of positive helicity was injected during the five days corresponding with the rapidly sunspot clockwise rotation. Many flares have been produced by this active region from September 3 to 7, 2011. Among them, three big flares M5.3, X2.1 and X1.8 were observed. Using the vector magnetograms of the HMI with 12 minute cadence, We present temporal profiles of non-potential parameters. We find that the extreme value of twist parameters in the shear region R has correspondence with the flare peak time.