The composition of solar energetic particles

  • McGuire R
  • von Rosenvinge T
  • McDonald F
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Abstract

The present measurements of elemental abundances in 15 large solar energetic particle events confirm the existence of two major effects: systematic differences between solar energetic particle abundances and photospheric abundances that are approximately correlated with first ionization potential (implying that the solar corona is the likely source population for these particles), and an enhancement of heavy ion abundances relative to a baseline of solar energetic particle abundances whose magnitude increases with rising atomic number. These data suggest the possibility that the degree of heavy ion enhancement has some correlation with spectral slope, and confirm that the aforementioned effects are not due to time or energy variations within individual events. The maximum column density above the solar acceleration region is less than 0.1 g/sq cm, on the basis of these data.

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McGuire, R. E., von Rosenvinge, T. T., & McDonald, F. B. (1986). The composition of solar energetic particles. The Astrophysical Journal, 301, 938. https://doi.org/10.1086/163958

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