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Fig. 1


Summary of multi-day 3He periods and related solar activity. Left: Period 1, right: Period 2 a) GOES SXR flare flux in the energy band of 18 Å. Arrows at the top point to the SXR flares in the candidate ARs and flares in other ARs are not marked. b) The EUV 193 Å excess intensity, the average AR flux (see Sect. 2.1) observed by AIA/SDO and STA in AR11124 (black); 11123 (blue, purple) in period 1 and AR11613 (black); and 11617 (blue, purple) in period 2. The intensity extension of AR11123 and 11617, which are integrated in EUVI/STA, is shown in purple for two periods. ARs are labeled with the last three digits of their names e.g., AR11124 is labeled as 124. c) 0.230.32 MeV/n 1 h averaged 3He (black) and 4He (blue) intensity observed by ULEIS/ACE. The purple lines show the approximate start time of each event at 1 AU, shown in Table 1. d) Helium mass spectrogram in energy range 0.410 MeV/n. e) Inverted ion velocity time spectrogram in mass range 1070 AMU. f) The 5 min averaged electron intensity at EPAM/ACE in four energy bands: 0.0380.053 MeV(purple), 0.0530.103 MeV(blue), 0.1030.175 MeV (green), and 0.1750.315 MeV (red). The gray regions mark the time window for the 3He ions release time from the Sun (see Sect. 2.1).

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