Elemental Abundances in Coronal Structures |
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Authors: | John C Raymond Raid Suleiman John L Kohl Giancarlo Noci |
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Institution: | (1) Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA;(2) Universitá di Firenze, I-50125 Firenze, Italy |
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Abstract: | A great deal of evidence for elemental abundance variations among different structures in the solar corona has accumulated
over the years. Many of the observations show changes in the relative abundances of high- and low-First Ionization Potential
elements, but relatively few show the absolute elemental abundances. Recent observations from the SOHO satellite give absolute
abundances in coronal streamers. Along the streamer edges, and at low heights in the streamer, they show roughly photospheric
abundances for the low-FIP elements, and a factor of 3 depletion of high-FIP elements. In the streamer core at 1.5 R·, both
high- and low-FIP elements are depleted by an additional factor of 3, which appears to result from gravitational settling.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Abundances Coronal Streamers |
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