Other
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt.........6l&link_type=abstract
Ph.D. Thesis New York Univ., New York.
Other
Chromosphere, Emission Spectra, Faculae, Stellar Rotation, Sunspots, Fraunhofer Lines, H Lines, K Lines, Signal To Noise Ratios, Solar Magnetic Field
Scientific paper
Temporal variations were studied in the emission features in the cores of the Ca II, H, and K Fraunhofer lines and in the wavelength 396.94 nm line of Fe II from April 1980 to November 1982. High resolution spectra were obtained with a 1.8 m focal length Ebert-Fastie monochromator in the neighborhoods of the cores of the H and K lines. The relative intensities and positions of the emission features in the cores of the H and K lines were measured along with the intensity of the wavelength 396.94 nm line of Fe II. Tests were made of possible correlations between standard parameters of solar magnetic activity and the spectral data in order to study the possibility of using Ca II, H, and K core emission measurements as a gauge of magnetic activity in other stars. A search for periodicities in the spectral as well as in the standard solar data during this time period was done as a further test of such correlations; as well as to establish a possible method for determining stellar rotation periods. Significant correlations were found between the K line emission feature positions and the sunspot number, the Ca II plage index, and the 2800 MHz emissions. A periodicity corresponding to the solar rotation period was found in all of the Ca II observations with the K line data giving results with the best signal-to-noise ratios.
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