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Brightness fluctuations in the K-line wings
Authors:Milton Y Cha  Frank Q Orrall
Institution:(1) Institute for Astronomy, University of Hawaii, 96822 Honolulu, Hawaii, U.S.A.
Abstract:A power-spectrum and cross-spectrum analysis has been made of measurements of temporal fluctuations of intensity observed in the K-line wing (2.07 Å from line center) and of simultaneous measurements of temporal fluctuations of Doppler displacement of the cores of lambda3931.122 Fe i and lambda3933 Ca ii (K3). The measurements were made in a quiet region near the center of the Sun's disk. We find that the average power spectra of the intensity fluctuations have two significant peaks of about equal strength: one at 0.0033 Hz (300-s period); and one at about 0.001 Hz (1000-s period). The average rms value of these intensity fluctuations is 0.0435±0.0082. Maximum brightness comes before maximum violet displacement of the Fe i line. The mean of the best determined phases is 137° and of all the data 108°. At those places on the Sun where the 300-s oscillations can be identified in the k3 core, the Doppler displacement of the Fe i line leads that of the K3 core by a mean phase angle of 27°.
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