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 1−8 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) 0.23−0.32 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 0.4−10 MeV/n. e) Inverted ion velocity time spectrogram in mass range 10−70 AMU. f) The 5 min averaged electron intensity at EPAM/ACE in four energy bands: 0.038−0.053 MeV(purple), 0.053−0.103 MeV(blue), 0.103−0.175 MeV (green), and 0.175−0.315 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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