Measurements of the K-Line in Spectra of Sunspots.

Abstract

view Abstract Citations (3) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Measurements of the K-Line in Spectra of Sunspots. Mohler, Orren C. Abstract Line in Spectra of Sunspots. ORREN C. MoBLER, McMath-Hulbert Obseo'vatory. The structure of the center of the K4ine in spectra of sunspots has been observed on a number of occasions. The structure of the K-line exactly over the umbra most frequently shows a double reversal much like that present in the normal solar disk with the difference that the reversal in the umbra of a sunspot consists of two narrow components separated by about 4 to 61 the separation of the emission components that appear in normal disk spectra. The next most frequent structure visible in sunspots is a featureless line with a width approximately double that of the reversed emission components. In a small number of spots the structure is so completely disorganized that no general features have been found. In a normal plage region near the center of the disk the separation of the brightly reversed components of the K4ine averages less than 0.75A. The separation varies linearly from its value in the adjacent plage to the narrow separation (about 0.090A) observed in the umbra of the sunspot. These values should be compared with the separation for the normal disk of about 0.600A. The intensities of the emission components in the sunspot spectra are very low, approximately 4 the intensity of the K3 emission components in the undisturbed center of the solar disk. Often the emission seems to be completely absent unless special care is used in making the photographic observations. Publication: The Astronomical Journal Pub Date: 1960 DOI: 10.1086/108061 Bibcode: 1960AJ.....65Q..55M full text sources ADS |