Photospheric abundances of oxygen, neon, and argon derived from the XUV spectrum of an impulsive flare
- E. O. Hulburt Center for Space Research, Washington, DC (USA)
Relative elemental abundances of O, Ne, Na, Mg, Ar, and Ca are determined from detailed analysis of XUV spectra emitted by an impulsive flare. The electron density measured from three diagnostic line ratios is 2-3 x 10 to the 12th/cu cm. It was found that the relative abundances in the flare are similar to values obtained from or proposed for photospheric material. The ratios of O/Mg, Ne/Mg, and Ar/Mg are about four times higher in the impulsive flare than the values typically observed in the average corona. It is suggested that electric fields above the photosphere may be responsible for the order of magnitude variations between the abundances of the group of elements with high first ionization potentials (FIP) and the group with low FIP. 18 refs.
- OSTI ID:
- 6316064
- Journal Information:
- Astrophysical Journal; (USA), Vol. 363; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
Similar Records
THE MYSTERIOUS CASE OF THE SOLAR ARGON ABUNDANCE NEAR SUNSPOTS IN FLARES
NEON AND OXYGEN ABUNDANCES AND ABUNDANCE RATIO IN THE SOLAR CORONA
Related Subjects
GENERAL PHYSICS
PHOTOSPHERE
CHEMICAL COMPOSITION
SOLAR FLARES
EXTREME ULTRAVIOLET SPECTRA
ARGON
CALCIUM
ELECTRONS
ELEMENT ABUNDANCE
EMISSION SPECTRA
EXTREME ULTRAVIOLET RADIATION
FLUX DENSITY
IONIZATION
MAGNESIUM
NEON
OXYGEN
SODIUM
ABUNDANCE
ALKALI METALS
ALKALINE EARTH METALS
ATMOSPHERES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FLUIDS
GASES
LEPTONS
METALS
NONMETALS
RADIATIONS
RARE GASES
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SPECTRA
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA
640104* - Astrophysics & Cosmology- Solar Phenomena