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- W2069702937 abstract "view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS An analysis of the spectra of sunspots. Howard, Robert Abstract Spectra of three sunspots were obtained on several of the first days of their growth with the i6-inch coronograph of the Sacramento Peak Observatory. The equivalent widths of fifty lines were measured. These lines were selected to obtain the minimum magnetic intensification. Curves of growth were drawn and 43000 was derived as the average excitation temperature for iron. This value is an upper limit because of the effects of scattered photospheric light. The turbulent velocity derived from the curve of growth was 2.5 km/sec, from line profiles 1.8 ~ 0.2 km/sec. Both these values should be considered as lower limits because of the effects of scattered photospheric light, and both these values are higher than the turbulent velocities for the photosphere. Princeton University Observatory Princeton, N. J. Publication: The Astronomical Journal Pub Date: 1957 DOI: 10.1086/107637 Bibcode: 1957AJ.....62R.143H full text sources ADS |" @default.
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- W2069702937 date "1957-01-01" @default.
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- W2069702937 title "An analysis of the spectra of sunspots." @default.
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