ner_tags: O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Instrument I-Instrument O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Instrument O O O O O O O O O O O O O O O O O O O O O O O O O O B-Model I-Model O O O O O O O O O O O O O O B-Formula I-Formula I-Formula I-Formula O O O O O O O O O O O O O O O O O O O O O B-Model O O O O O O O O O O O O O O O B-Mission B-Instrument O B-Instrument O B-Instrument O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Model I-Model O O O O O O O O O O O O B-Instrument O O O O O O O O O O O O O O O O O O O O O O B-Mission B-Instrument O O O B-Mission B-Instrument O O O O O O O O O O O O O O O O B-Mission B-Instrument O O O O O O O B-Mission B-Instrument O O O O O O O O O O O O O O O O O O O O O B-Instrument O O O O O O O O O O B-Instrument O O O O O O O B-Mission B-Instrument O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Mission B-Instrument O O O O O O O O O O O O O O O O O O O O B-Mission B-Instrument O O O O O O O O O O O O O O O O B-Mission B-Instrument O B-Mission B-Instrument O B-Instrument O O O O O O O O O O O O O O O O O O O O O O O O O O B-Instrument O O O O O O O O O O O O O B-Instrument O O O O O O O O O O
tokens: right edges of the distribution correspond to the points at which particles just enter and exit the E ′ detector, L1, and are caused by anticorrelated variations of Δ E and E ′, which can occur as a result of variations in the particle path lengths through the Δ E detector (e.g., caused by differences in incidence angle) or Bohr/Landau fluctuations in Δ E . Simulations of the instrument response can be used to take these effects into account. Particles with E / M values beyond the high-energy end of the distribution are detected and identified using detectors deeper in the telescope. The relatively small number of He nuclei reaching the L2 detector in this weak event were not used in this study. Figure 6 shows mass histograms that result from projecting the data shown in Figure 5 on the mass axis. The middle panel corresponds to the region of the IS⊙IS/EPI-Hi plot to the left of the vertical red line and the right panel to the region to the right of this line. The red curves show Gaussian fits to the central regions of the peaks, which result in similar standard deviations of σ M = 0.18 and 0.20 amu for the low- and high- E / M regions, respectively. However, the low-energy mass peak has more prominent non-Gaussian tails. Figure 6. Mass histograms for the time period 2019-109 12:00 to 2019-113 12:00 from ACE /ULEIS and IS⊙IS/EPI-Hi. The IS⊙IS/EPI-Hi histograms are shown for two subsets of the data selected based on whether the E / M value is less than or greater than 1.2 MeV nucleon –1 , where E / M is calculated from the total energy and the assumption that M = 4. Red curves show Gaussian fits to the central regions of the 4 He peaks in the two IS⊙IS/EPI-Hi panels. Figure 7 shows the derived masses of the detected He events as a function of the time of detection at both PSP /IS⊙IS/EPI-Hi (top panel) and ACE /ULEIS (bottom panel). In order to obtain good separation between and , only those He events from PSP /IS⊙IS/EPI-Hi that have MeV nucleon –1 were used. ACE /ULEIS measured the highest intensity of both He isotopes on 2019-110 before midday. This was during one of the intervals during which IS⊙IS/EPI-Hi was turned off (gray bands). After midday on 2019-111, when IS⊙IS/EPI-Hi observed the highest intensity of both isotopes, ACE /ULEIS was still observing , but intensities of both He isotopes were lower than they had been during the first half of the previous day. The event at PSP /IS⊙IS/EPI-Hi continued through much of 2019-112, being cut off when the instrument was again turned off around 18:30 on 2019-112. At ACE /ULEIS, no He was observed after midday on 2019-112. Figure 7. Calculated He mass vs. time from PSP /IS⊙IS/EPI-Hi and ACE /ULEIS. The IS⊙IS/EPI-Hi data are restricted to events from the >1.2 MeV nucleon –1 subset shown in the right panel of Figure 6 . Gray regions indicate times when IS⊙IS/EPI-Hi was turned off. To derive abundance ratios between and , we have used IS⊙IS/EPI-Hi data from the E / M interval 1.35–1.75 MeV nucleon