On the dependence of solar flare X-ray spectral line intensity ratios of highly ionized sulfur, calcium, and iron on electron temperature, differential emission measure, and atomic physics

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169019· OSTI ID:6550747

Doschek, G A; Fludra, A; Bentley, R D; Lang, J; Phillips, K J.H. ^[1]

---

1. E. O. Hulburt Center for Space Research, Washington, DC (USA) London Univ. College, Dorking (England) Rutherford Appleton Laboratory, Didcot (England)

This paper focuses on what can be learned about the emission measure distribution and certain atomic physics parameters from spectral lines of highly ionized ions of sulfur, calcium, and iron that appear in solar flare spectra. The particular lines chosen for analysis allow the electron temperature to be determined independently of the assumption of ionization equilibrium. An attempt is made to find emission measure models based on selected functional dependences of emission measure on temperature that reproduce the observed temperatures deduced from spectral line ratios as well as the relative intensities of resonance lines of different elements. 32 refs.

• OSTI ID: 6550747
• Journal Information: Astrophysical Journal; (USA), Vol. 358; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SOLAR FLARES
X-RAY SPECTRA
CALCIUM IONS
ELECTRON TEMPERATURE
EMISSION SPECTRA
IRON IONS
RADIANT FLUX DENSITY
SULFUR IONS
CHARGED PARTICLES
FLUX DENSITY
IONS
SOLAR ACTIVITY
SPECTRA
640104* - Astrophysics & Cosmology- Solar Phenomena