Connecting solar flare hard X-ray spectra to in situ electron spectra - A comparison of RHESSI and STEREO/SEPT observations

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Table 2.

Pearson correlation coefficients C between photon spectral index γ and in situ electron spectral index δ.

	All	Medium and large	Large

	events	anisotropy	anisotropy
No. of events	17	9	4
γ vs. δ₁	0.50 ± 0.19	0.69 ± 0.20	0.61 ± 0.55
γ vs. δ₂	0.49 ± 0.19	0.27 ± 0.44	0.28 ± 0.77
γ vs. δ₁⁽¹⁾	0.80 ± 0.08	0.86 ± 0.09	0.96 ± 0.06
γ vs. δ₂⁽²⁾	0.79 ± 0.09	0.88 ± 0.18	1.0 ± 10⁻⁴

Notes.

⁽¹⁾

Also given are the uncertainties on C based on a bootstrapping approach. In situ electron spectral index δ₂ has been used for the three special events (see text).

⁽²⁾

In situ electron spectral index δ₂ has been excluded for the three special events (see text).

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