Are Helium Line Intensities Affected By Abundance Variations?

Details Are Helium Line Intensities Affected By Abundance Variations? Are Helium Line Intensities Affected By Abundance Variations?

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..347h&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

Astronomy and Astrophysics

Astrophysics

Scientific paper

In situ solar wind measurements show that the helium abundance in the outer solar atmosphere is far from being constant. A considerable amount of theoretical research (e.g., Hansteen et al. 1997, ApJ 482, 498) has isolated the physical mechanisms that determine helium abundance variations along an open magnetic field line: gravitational settling in both the chromosphere and corona tends to transport helium downward, while the thermal force in the transition region and the drag force exerted by solar wind protons in the corona transport helium outward, and mixing processes work towards keeping everything in balance. The mixing efficiency is conceivably different in magnetically open and closed regions; and wind drag is missing altogether in the latter. This poster discusses if such differences might help to understand some of the features observed in the important helium lines accessible to several SoHO instruments.

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