Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...505..999f&link_type=abstract
The Astrophysical Journal, Volume 505, Issue 2, pp. 999-1006.
Astronomy and Astrophysics
Astronomy
87
Sun: Abundances, Sun: Corona
Scientific paper
Using spectra obtained by the SUMER instrument on the Solar and Heliospheric Observatory (SOHO) we have determined the composition of the bulk of the coronal plasma in the vicinity of the solar surface over a polar coronal hole and an equatorial region. Our measurements show that although low first ionization potential (FIP) elements are enriched by about a factor of 4 in the corona above the quiet equatorial region, little or no enrichment exists above the north polar coronal hole. These observations are in good agreement with the Ulysses in situ observations in both fast speed and slow speed winds.
Feldman Uri
Laming Martin J.
Schühle Udo
Widing Kenneth G.
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