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The 3He-rich SEP on Event 2024 April 1 at 27 Solar Radii—Indications of Acceleration by Waves and Implications of Coronal Source Location

  • Authors: D. G. Mitchell, D. Lario, N. E. Raouafi, G. M. Mason, A. Kouloumvakos, H. Collier, E. C. Roelof, G. Berland, D. J. McComas, C. M. S. Cohen, M. E. Hill, R. L. McNutt, P. S. Mostafavi, J. C. Kasper, S. D. Bale, M. Pulupa, P. L. Whittlesey

D. G. Mitchell et al 2026 The Astrophysical Journal 1003 .

  • Provider: AAS Journals

Caption: Figure 3.

Histogram of species abundances over the energy range 40–250 keV nucleon−1. The hydrogen peak is artificially low, both because there is a priority boundary between H and He in the flight software event-selection process that suppresses the number of protons telemetered, and because the proton spectrum is not sampled below 80keV, the lower threshold of EPI-Lo for this measurement. 3He and 4He are sampled with equal priority and over the full energy range, thus the observed ∼3:1 ratio of 3He/4He is reliable.

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