Magnetic helicity evolution during active region emergence and subsequent flare productivity

Open Access

Fig. 9.

Scatter plots of the flare index versus the (a) accumulated helicity ΔH, (b) normalized helicity ΔH/ $Φ_{p}^{2}$ $\Phi_{\rm p}^2$ , and (c) ΔH − ΔE diagram. The color of the scatters in panel (c) indicate the value of the flare index. The black straight line represents the result of the least-squares best logarithmic fits between ΔE and ΔH.

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