Accession Number : AD0709356

Title :   STUDY OF SPECTROHELIOGRAMS IN METAL LINES AND THE CHROMOSPHERE STRUCTURE,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Dubov,E. E.

Report Date : APR 1970

Pagination or Media Count : 31

Abstract : Distributions of bright and dark parts of spectroheliograms obtained in metal lines (Fel 4202 A, 4384 A, Cal 4227 A, SrII 4078 A, NaI 5890 A and K3CaII) at different distances from line centers are compared. It is concluded that these brightness distributions do not contradict the idea on the structure of the chromosphere which were developed by the author in Dubov, (1967). The brightness distributions on metal lines in spectroheliograms mainly reflect the structure of the velocity fields in the photosphere and the distribution of photospheric faculae in active regions. Ascending motions are obsrved mostly near boundaries of supergranules (except for the D2NaI line). The stronger the line, the greater is the influence of the structure of the atmosphere on the brightness distribution on the corresponding spectroheliogram. This effect is expressed most clearly on the Na 5890 A line. The descent of matter (as in H sub alpha) is observed most frequently on this line near the boundaries of super-granules. According to the brightness distributions on spectroheliograms which were taken on the ionized strontium 4078 A line, it can be assumed that both relatively deep layers of the photosphere and a rather high layer of the chromosphere take part in the formation of the outgoing radiation on this line. (Author)

Descriptors :   (*CHROMOSPHERE, LINE SPECTRA), SPECTROSCOPY, IONIZATION, ASTRONOMICAL CAMERAS, HYDROGEN, SHOCK WAVES, IRON, CALCIUM, STRONTIUM, SODIUM, USSR

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE