A Volcanic Origin for High-FIP Material in the Solar Atmosphere

Details A Volcanic Origin for High-FIP Material in the Solar Atmosphere A Volcanic Origin for High-FIP Material in the Solar Atmosphere

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...440..884s&link_type=abstract

Astrophysical Journal v.440, p.884

Astronomy and Astrophysics

Astronomy

34

Sun: Abundances, Sun: Activity, Sun: Magnetic Fields, Sun: Sunspots

Scientific paper

Photospheric magnetograms and Skylab images in the lines of Ne VI and Mg VI near 400 Å have been used to study the relation between magnetic field topology and solar composition. Although plasma with the neon-rich photospheric composition is rare in the corona, it always occurs where new flux is emerging. This suggests that the neon richness of the plasma reflects its recent photospheric origin, not its closed-loop magnetic topology as has been assumed in the past. Such a "volcanic" process would be consistent with our observations of sunspots, which have the Ne-rich composition when they lie next to a neutral line where flux is emerging, but have the Mg-rich composition when they are surrounded by a "buffer zone" of like-polarity flux.

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