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Properties of Different Coronal Streamers

Published online by Cambridge University Press:  13 May 2016

S. Parenti ,
B. J. I. Bromage ,
G. Poletto ,
G. Noci ,
J. C. Raymond  and
G. E. Bromage
S. Parenti
Affiliation:
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK Run in Address to Make Minimum Number of Lines
B. J. I. Bromage
Affiliation:
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK
G. Poletto
Affiliation:
Osservatorio Astrofisico di Arcetri, I-50125 Firenze, Italy
G. Noci
Affiliation:
Universita' di Firenze, I-50125 Firenze, Italy
J. C. Raymond
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
G. E. Bromage
Affiliation:
Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK

Abstract

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In this paper a summary of results from coordinated observations of streamers acquired by the SOHO Coronal Diagnostic Spectrometer (CDS) and Ultra Violet Coronograph Spectrometer (UVCS) experiments is presented (Parenti et al. 2000). Data from different altitudes within the solar corona were taken, with the purpose of determining their physical parameters – densities, electron temperatures and element abundances – and their changes over the altitude range between 1.02 and 1.6 R⊙. Further UVCS streamer data, taken about two months later are used to compare with the behaviour seen in two different streamers. The streamers resulted to have a different behaviour in temperature and density. The low corona, covered by CDS data, shows little evidence of abundance variation with respect to photospheric values, while, at UVCS altitudes, a depletion of all element abundances is clearly evident.

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. 413 - 415
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

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Raymond, J.C. et al. 1997, Solar Phys, 175.Google Scholar