Enhanced emission of iron nuclei in solar flares

  • P. B. Price
  • , I. Hutcheon
  • , R. Cowsik
  • , D. J. Barber

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Etched tracks in an Apollo-12 spacecraft window and a Surveyor-3 camera-lens filter give the interplanetary Fe energy spectra from ∼1 to ∼30 MeV/nucleon during 1967-1969. The strongly energy-dependent Fe/He ratio suggests that heavy nuclei are preferentially emitted from accelerating regions because of their low ionization state and high magnetic rigidity. The Fe fluxes give rise to extremely high track densities that we have observed in lunar soil.

Original languageEnglish
Pages (from-to)916-919
Number of pages4
JournalPhysical Review Letters
Volume26
Issue number15
DOIs
StatePublished - 1971

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