The high Ne/C and Ne/O abundance ratios in the footpoints of solar flares

Details The high Ne/C and Ne/O abundance ratios in the footpoints of solar flares The high Ne/C and Ne/O abundance ratios in the footpoints of solar flares

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..221s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, July 15, 1991, p. 221-226.

Astronomy and Astrophysics

Astronomy

22

Atmospheric Radiation, Chromosphere, Gamma Ray Spectra, Solar Flares, Stellar Composition, Carbon, Energetic Particles, Helium, Ionization Potentials, Neon, Oxygen, Solar Corona

Scientific paper

High chromospheric abundance ratios of Ne/C and Ne/O were deduced from the gamma-ray spectroscopy of the 1981 April 27 flare. A similar high Ne/O ratio was observed in energetic solar particles from He-3-rich flares. These high ratios are consistent neither with local galactic abundances, nor with the first ionization-potential scenario (Meyer 1985). The inconsistency is explained by temporal deviations from the quiet-chromosphere abundances in the nuclear (gamma-ray) line production region (the interaction region). During the flare soft X-ray radiation penetrates through the chromosphere and creates a slab-like region of nonthermal ionization ratios, i.e., ionized neon mixed with mostly neutral carbon and neutral oxygen below the interaction region. Charge-dependent mass transport upward from this slab causes an enhancement of Ne/C and Ne/O ratios at the interaction region. These considerations constrain the use of gamma-ray abundances as indicators of quiet-chromosphere abundances.

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