SOHO/SUMER Measurements of the Solar Coronal Helium Abundance

Details SOHO/SUMER Measurements of the Solar Coronal Helium Abundance SOHO/SUMER Measurements of the Solar Coronal Helium Abundance

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.5716l&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #57.16; Bulletin of the American Astronomical Society, Vol. 34, p.739

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Scientific paper

We report on the progress of work to measure the helium abundance in various regions of the solar corona. Concentrating on polar coronal holes, we find similar helium abundances to those measured in the fast solar wind, i.e. 4-5% by number relative to hydrogen at an altitude approximately 100 arcseconds above the limb. This suggests that the flows of hydrogen and helium up into the fast solar wind must be locked together, presumably by plasma waves, since otherwise large variations of the He/H abundance ratio could result. This work is supported by the NRL/ONR Solar Magnetism and the Earth's Environment 6.1 Research Option and by NASA Contract S137836.

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