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Title:
Elemental abundances in the upper solar atmosphere of quiet and coronal hole regions (Te is approximately equal to 4.3 X 10 exp 5 K)
Authors:
Feldman, U.; Widing, K. G.
Affiliation:
AA(U.S. Navy, E.O. Hulburt Center for Space Research, Washington), AB(U.S. Navy, E.O. Hulburt Center for Space Research, Washington)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 1, p. 381-388. (ApJ Homepage)
Publication Date:
09/1993
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Abundance, Coronal Holes, Solar Atmosphere, Solar Corona, Solar Wind, Energetic Particles, Ionization Potentials, Limb Brightening, Photosphere
DOI:
10.1086/173084
Bibliographic Code:
1993ApJ...414..381F

Abstract

Detailed examination of the sun's upper atmosphere reveals that elemental abundances vary between different solar regions. Some solar regions exhibit the well-established photospheric abundances, while in other regions the abundances of some elements diverge from photospheric by an order of magnitude, and perhaps even more. Elemental abundances in the solar wind (SW) are also different from elemental abundances in the photosphere. It is postulated that elemental abundances in the SW reflect the elemental abundances of their place of origin near the solar surface. The solar surface is covered, predominantly, by quiet and coronal hole regions. In this paper we measure the intensities of limb-brightening rings over quiet and coronal hole regions in lines of Mg VI and Ne VI (Te is approximately equal to 4.3 x 10 exp 5 K) and determine the relative elemental abundances of the features producing the rings. The rings are formed by a plasma component occupying only a small fraction of the immediate volume above the solar surface.

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