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Title: MEASURING SOLAR ABUNDANCES

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
786199
Report Number(s):
LA-UR-01-4993
TRN: AH200137%%57
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Sep 2001
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; SOLAR RADIATION; ABUNDANCE; MEASURING METHODS

Citation Formats

R. WIENS, D. REISENFELD, and ET AL. MEASURING SOLAR ABUNDANCES. United States: N. p., 2001. Web.
R. WIENS, D. REISENFELD, & ET AL. MEASURING SOLAR ABUNDANCES. United States.
R. WIENS, D. REISENFELD, and ET AL. 2001. "MEASURING SOLAR ABUNDANCES". United States. doi:. https://www.osti.gov/servlets/purl/786199.
@article{osti_786199,
title = {MEASURING SOLAR ABUNDANCES},
author = {R. WIENS and D. REISENFELD and ET AL},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2001,
month = 9
}

Conference:
Other availability
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  • This is the rapporteur paper of Working Group 2 on Measuring Solar Abundances. The working group presented and discussed the different observations and methods for obtaining the elemental and isotopic composition of the Sun, and critically reviewed their results and the accuracies thereof. Furthermore, a few important yet unanswered questions were identified, and the potential of future missions to provide answers was assessed.
  • Elemental abundance of the ambient gas at the site of gamma-ray line production in the solar atmosphere are deduced using gamma-ray line observations of a solar flare. The resultant abundances are different from local galactic abundances which are thought to be similar to photospheric abundances.
  • Recent studies have shown that there are well defined average abundances of heavy ({ital Z}{gt}2) solar energetic particles (SEPs), with variations in the acceleration and propagation producing a systematic flare-to-flare fractionation that depends on the charge per unit mass of the ion. Correcting the average SEP abundances for the fractionation yields SEP-derived coronal abundances for 20 elements. Higher resolution SEP studies have also provided isotopic abundances for 5 elements. SEP-derived abundances indicate that elements with high first ionization potentials ({gt}10 eV) are depleted in the corona relative to the photosphere and provide new information on the solar abundance of Cmore » and {sup 22}Ne. Future SEP observations offer the prospect of a significant reduction of the uncertainties in solar elemental and isotopic abundances.« less