Effect of the Line-of-Sight Integration on the Profiles of Coronal Lines

Details Effect of the Line-of-Sight Integration on the Profiles of Coronal Lines Effect of the Line-of-Sight Integration on the Profiles of Coronal Lines

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547..401r&link_type=abstract

Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO a

Computer Science

Line Profiles, Solar Corona, Solar Wind

Scientific paper

We reexamine the interpretation of coronal observations aiming at the determination of the coronal magnetic field and/or the solar wind velocity vectors. In particular we investigate the effect of the integration along the line-of-sight on the profiles of O vi spectral lines emitted in the corona employing a simple model of the large scale coronal magnetic field and solar wind. Here we present preliminary results. We concentrate on the polar coronal holes and find that although the line-of-sight integration is not important at small heights, the width of the emitted line is increasingly affected when moving outwards from the solar disk. At distances of 2.5 R and greater the width of the profile integrated along the LOS is more than 2 times as larger as the line profile obtained from an elementary emitting volume on the polar axis.

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