Two-dimensional nonlocal thermodynamic equilibrium transfer computations of resonance lines in quiescent prominences

Journal Article · Mon Mar 15 04:00:00 EST 1982 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/159789· OSTI ID:5290370

Vial, J C

We use the two-dimensional transfer code of Mihalas, Auer, and Mihalas to compute emergent profiles of resonance lines of H I, Mg II, and Ca II. The model (a uniform slab limited in two directions) and the thermodynamic and radiative quantities are described. Metallic line profiles are sensitive to the ionization degree (n/sub p//n/sub 1/ varying from 1 to 10). Some modifications are implemented in the code (especially, the true incident profiles of chromospheric lines). Two-dimensional and one-dimensional profiles are compared. A good agreement between computed and observed profiles is found for LY..cap alpha.. and Ca II, but not for Mg II lines. Radial velocities improve the agreement. We discuss necessary improvements in the computations and the observations of resonance lines in prominences.

• Research Organization: Laboratoire de Physique Stellaire et Planetaire, Verrieres-le-Buisson, France
• OSTI ID: 5290370
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 254:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
CALCIUM IONS
CHARGED PARTICLES
ELEMENTS
HYDROGEN
IONIZATION
IONS
LYMAN LINES
MAGNESIUM IONS
MATHEMATICAL MODELS
NONMETALS
RADIAL VELOCITY
RADIATION TRANSPORT
RESONANCE
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR PROMINENCES
STAR MODELS
THERMODYNAMICS
TWO-DIMENSIONAL CALCULATIONS
VELOCITY