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Title:
Temperature dependence of the abundances of elements in solar He-3 rich events
Authors:
Reames, D. V.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. L53-L55. (ApJL Homepage)
Publication Date:
02/1988
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Abundance, Helium Isotopes, Solar Flares, Temperature Dependence, Heavy Elements, Solar Corona, Solar X-Rays, Stellar Composition, X Ray Spectra
DOI:
10.1086/185109
Bibliographic Code:
1988ApJ...325L..53R

Abstract

The element abundances in solar He-3-rich events are observed to vary with the soft X-ray temperature of the parent flare. The observations are consistent with thermal collisional ionization of the elements to the equilibrium-charge states expected within the flare-heated plasma at (10-15) x 10 to the 6th K. Proposed photoionization mechanisms appear to be excluded. Rapid ionization of the ions requires that the heating occur sufficiently low in the corona that the electron density exceed about (1-5) x 10 to the 8th/cu cm. Heavy-element enhancements might be a signature of material processed in the flash phase of events in contrast to unheated ambient material accelerated by a coronal shock.

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