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Looking for the FIP Effect in EUV Spectra

Published online by Cambridge University Press:  13 May 2016

B. N. Dwivedi ,
E. Landi  and
A. Mohan
B. N. Dwivedi
Affiliation:
Dept. of Appl. Phys., Banaras Hindu Univ., Varanasi-221005, India
E. Landi
Affiliation:
Max-Planck-Institut für Aeronomie, 37191 Katlenburg-Lindau, Germany
A. Mohan
Affiliation:
Dept. of Appl. Phys., Banaras Hindu Univ., Varanasi-221005, India

Abstract

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We present results from a study of extreme-ultraviolet (EUV) off-limb spectra obtained with the SUMER instrument on the spacecraft SOHO. Using EUV line intensities, we deduce plasma temperatures and densities in the off-limb solar plasma. We make use of this information to study the FIP effect in the solar corona. We have looked for FIP effect in EUV spectra obtained by SUMER in a considerable detail. In particular, we report K/Ar, Si/Ar and S/Ar relative element abundances and investigate the height dependence of the FIP bias in the solar corona. Also, we study the relative Mg/Ne abundance in an active region at the solar limb to investigate the correlation of the FIP bias with magnetic loop structures in the field of view.

Type
Session IV: Structure and Dynamics of the Transiton Region and Corona
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 356 - 358
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

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