Abundance ratios of oxygen, neon, and magnesium in solar active regions and flares: The FIP effect

Details Abundance ratios of oxygen, neon, and magnesium in solar active regions and flares: The FIP effect Abundance ratios of oxygen, neon, and magnesium in solar active regions and flares: The FIP effect

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...442..446w&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 442, no. 1, p. 446-450

Astronomy and Astrophysics

Astrophysics

21

Abundance, Line Spectra, Magnesium, Neon, Oxygen, Solar Flares, Solar Prominences, Ion Emission, Ratios, Spectrum Analysis, Temperature Dependence

Scientific paper

Relative abundances of oxygen, neon, and magnesium have been derived for a sample of nine solar active regions, flares, and an erupting prominance by combining plots of the ion differential emission measures. The observations were photographed in the 300-600 A range by the Naval Research Laboratory (NRL) spectroheliograph on Skylab. Methods for deriving the Mg/Ne abundance ratio-which measures the separation between the low- first ionization potential (FIP) and high-FIP abundnace plateaus-have been described in previous papers. In this paper we describe the spectroscopic methods for deriving the O/Ne abundance ratio, which gives the ratio between two high-FIP elements. The plot of the O/Ne ratio versus the Mg/Ne ratio in the sample of nine Skylab events is shown. The variation in the Mg/Ne ratio by a factor of 6 is associated with a much smaller range in the O/Ne ratio. This is broadly consistent with the presence of the standard FIP pattern of abundances in the outer atmosphere of the Sun. However, a real change in the relative abundances of oxygen and neon by a factor of 1.5 cannot be excluded.

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