Abundance of iron ions in the solar wind

Details Abundance of iron ions in the solar wind Abundance of iron ions in the solar wind

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..956s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 956-966. SNSF-supported research.

Astronomy and Astrophysics

Astrophysics

18

Abundance, Cosmochemistry, Iron, Metal Ions, Solar Wind, Helium, Interplanetary Medium, Ionization Potentials, Metallicity, Shock Wave Propagation

Scientific paper

For a period of 4 yr near the maximum of solar cycle 21 iron and helium fluxes were measured in the solar wind. The ratio of the summed fluxes from 45,000 spectra is 400 (+50 percent, -30 percent) which is approximately 5 times lower than estimates of the solar surface value. This difference is attributed to the difference of first ionization potentials between the two elements, which leads to a preferential feeding of iron (with a lower ionization potential) into the coronal plasma, whereas helium has a tendency to remain below as a neutral species. A marked increase of the He/Fe ratio is observed in the driver gas following interplanetary shocks. Marginal depletions of helium relative to iron are found at the sector boundaries of the interplanetary magnetic field.

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