Fig. 4.

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Long period of 3He-rich SEPs and energy dependence of selected abundance ratios. Left: Solar Orbiter SIS He mass vs. time at 0.4–10 MeV nucleon−1. The sharp cutoff of particles around midday on November 19 was due to instrument maintenance. Right: event-integrated element ratios Fe/O and 4He/H over the period of 2020 November 24 12:00 UT–2020 November 27 00:00 UT vs. energy. The vertical dotted line marks the energy corresponding to the ratios in Fig. 3b. The measurements are from both SIS telescopes averaged together.
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