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Abundances of Potassium, Argon, and Sulphur in Solar Flares

Published online by Cambridge University Press:  26 May 2016

K. J. H. Phillips ,
J. Sylwester ,
B. Sylwester  and
E. Landi
K. J. H. Phillips
Affiliation:
National Research Council Senior Research Associate, NASA Goddard Space Flight Center, Code 682, Greenbelt, MD 20771, USA
J. Sylwester
Affiliation:
Space Research Centre, Polish Academy of Sciences, ul. Kopernika 11, 51-622 Wroclaw, Poland
B. Sylwester
Affiliation:
Space Research Centre, Polish Academy of Sciences, ul. Kopernika 11, 51-622 Wroclaw, Poland
E. Landi
Affiliation:
Artep Inc., Ellicott City, MD 21042, USA and E. O. Hulburt Center for Space Research, US Naval Research Laboratory, Washington DC 20375, USA

Abstract

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Observations of the 3.3—6.1 Â X-ray line and continuous spectrum during four long-duration flares with the RESIK crystal spectrometer on the Coronas-F spacecraft have been analyzed to get the absolute abundances of potassium, argon, and sulphur. A differential emission measure of the form DEM ∝ exp(—Te/T0) was found to give the most consistent results of three models including an isothermal model. We obtained K/H = (3.7 ± 1.0) x 10—7, a factor 3 times photospheric; Ar/H = (2.8 ± 0.2) x 10—6, slightly lower than photospheric; and S/H = (2.2±0.4) x 10—5, approximately equal to photospheric. These measurements are consistent with a pattern in which elements with low (< 10 eV) first ionization potential are enriched in the corona by a factor of about 3 and elements of high first ionization potential have abundances approximately equal to photospheric.

Type
Part 4: High Energy Phenomena in Sun and Stars
Information
Symposium - International Astronomical Union , Volume 219: Stars as Suns : Activity, Evolution and Planets , 2004 , pp. 176 - 180
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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