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The energy dissipation mechanism in blazar jet is unknown. Blazar's flarescould provide insights on this problem. Here we report statistical results ofXMM-Newton X-ray flares of Mrk 421. We analyze all public XMM-Newton X-rayobservations for Mrk 421, and construct the light curves. Through fitting lightcurves, we obtain the parameters of flare-profiles, such as peak flux ($F_{\rmp}$) and flaring time duration ($T_{\rm fl}$). It is found that both thedistributions of $F_{\rm p}$ and $T_{\rm fl}$ obey a power-law form, with thesame index of $\alpha_{\rm F}=\alpha_{\rm T}\approx1$. The statisticalproperties are consistent with the predictions by a self-organized criticality(SOC) system with energy dissipation in one-dimensional space. This is similarto solar flare, but with different space dimensions of the energy dissipationdomain. This suggests that X-ray flaers of Mrk 421 are possibly driven by amagnetic reconnection mechanism. Moreover, in the analysis, we find thatvariability on timescale of $\sim1000\ $s frequently appears. Such rapidvariability indicates a magnetic field of $\geq 2.1\delta_{\rm D}^{-1/3}$ G($\delta_{\rm D}$ is the Doppler factor) in emission region.

Statistical analysis on XMM-Newton X-ray flares of Mrk 421: distributions of peak flux and flaring time duration