The first gradual solar energetic particle event with an enhanced 3He abundance on Solar Orbiter

Solar Orbiter First Results (Nominal Mission Phase)

Open Access

Fig. 5.

³He mass peak and comparison of ³He and ⁴He counts s⁻¹ time profiles. Left: He mass histogram from the two SIS telescopes A and B for 2020 November 24 12:00 UT–2020 November 27 00:00 UT and energy range of 0.5–2.0 MeV nucleon⁻¹. The vertical dashed red lines mark the mass range for ³He count rates shown in the right panel. Right: SIS 1 h ⁴He and 6 h ³He count rates at 0.4–10 MeV nucleon⁻¹. The vertical dashed black line indicates the first appearance of the CME in the coronagraph.

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