Variable Ion Compositions of Solar Energetic Particle Events in the Inner Heliosphere: A Field Line Braiding Model with Compound Injections

Guo, Fan; Zhao, Lulu; Cohen, Christina M. S.; Giacalone, Joe; Leske, R. A.; Wiedenbeck, M. E.; Kahler, S. W.; Li, Xiaocan; Zhang, Qile; Ho, George C.; Desai, Mihir I.

doi:10.3847/1538-4357/ac3233

Title: Variable Ion Compositions of Solar Energetic Particle Events in the Inner Heliosphere: A Field Line Braiding Model with Compound Injections

Journal Article · 06 January 2022 · The Astrophysical Journal

DOI: https://doi.org/10.3847/1538-4357/ac3233 · OSTI ID:2005820

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
California Institute of Technology (CalTech), Pasadena, CA (United States)
Univ. of Arizona, Tucson, AZ (United States)
Air Force Research Lab. (AFRL), Kirtland Air Force Base, NM (United States)
Dartmouth College, Hanover, NH (United States)
Johns Hopkins Univ., Laurel, MD (United States)
Univ. of Texas at San Antonio, TX (United States); Southwest Research Institute, San Antonio, TX (United States)

We propose a model for interpreting highly variable ion composition ratios in solar energetic particle (SEP) events recently observed by the Parker Solar Probe (PSP) at 0.3–0.45 au. We use numerical simulations to calculate SEP propagation in a turbulent interplanetary magnetic field with a Kolmogorov power spectrum from large scales down to the gyration scale of energetic particles. We show that when the source regions of different species are offset by a distance comparable to the size of the source regions, the observed energetic particle composition He/H can be strongly variable over more than two orders of magnitude, even if the source ratio is at the nominal value. Assuming a ³He/⁴He source ratio of 10% in impulsive ³He-rich events and the same spatial offset of the source regions, the ³He/⁴He ratio at observation sites also vary considerably. The variability of the ion composition ratios depends on the radial distance, which can be tested by observations made at different radial locations. We discuss the implications of these results on the variability of ion composition of impulsive events and on further PSP and Solar Orbiter observations close to the Sun.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2005820

Report Number(s):: LA-UR--21-26912

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 924; ISSN 0004-637X

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Variable Ion Compositions of Solar Energetic Particle Events in the Inner Heliosphere: A Field Line Braiding Model with Compound Injections

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