Solar energetic electron events measured by MESSENGER and Solar Orbiter - Peak intensity and energy spectrum radial dependences: Statistical analysis

Solar Orbiter First Results (Nominal Mission Phase)

Open Access

Fig. 6.

Comparison between MESSENGER and near 1 au forward spectra. (a) Event representative of the STEREO peak-intensity energy spectrum showing a broken power law. The legend shows the values of the fit parameters: Spectral index below (δ₁) and above (δ₂) the spectral transition, and E_b (vertical dashed line). (b) Spectral indices near 1 au against the spectral indices at MESSENGER. The dashed line indicates equal indices. (c) SEE spectral index difference (δ200_MESS-δ200_{near_1au_forw}) against the spectral index calculated with MESSENGER measurements (δ200_MESS).

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