Accession Number : AD0621193

Title :   THE BEHAVIOR OF SOME LINES OF RARE-EARTH ELEMENTS ON THE SOLAR DISK,

Corporate Author : SACRAMENTO PEAK OBSERVATORY SUNSPOT N MEX

Personal Author(s) : Stefanovich,N. N.

Report Date : 1965

Pagination or Media Count : 11

Abstract : The behavior of equivalent widths and half-widths of some lines of rare earth elements on the solar disk was investigated: the center-limb effect, the transition from absorption to emission and the emission in active regions. The variation of the equivalent and half-widths for all the lines, from the center to the limb, was found to be alike and this was compared to that of other non-rareearth elements. The comparison shows that the W-values of the non-rare-earths increase from the center to the limb, while W-values of rare-earth elements decrease. For four lines of rare earth in the wings of H and K of Ca II lines an appearance of emission is observed when approaching the solar limb (about rho = 0.90). These four lines are strengthened in active regions and are observed in emission in some flares and flocculi at large distances from the limb (rho approx 0.65). (Author)

Descriptors :   (*SOLAR SPECTRUM, RARE EARTH ELEMENTS), (*RARE EARTH ELEMENTS, SOLAR SPECTRUM), (*ASTROPHYSICS, SOLAR SPECTRUM), SOLAR FLARES, SOLAR ATMOSPHERE, SOLAR RADIATION, EMISSIVITY, LINE SPECTRA, ABSORPTION SPECTRA, BAND SPECTRA

Distribution Statement : APPROVED FOR PUBLIC RELEASE