Solar rotation as marked by extreme-ultraviolet coronal holes

Physics

Scientific paper

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Autocorrelation, Far Ultraviolet Radiation, Solar Corona, Solar Rotation, Spectroheliographs, Line Spectra, Photosphere, Solar Atmosphere, Solar Magnetic Field, Solar Physics

Scientific paper

Spectroheliograms produced in the light of Fe XV lambda-284 by the Goddard Space Flight Center experiment on OSO-7 are used to determine solar rotational periods for low-emission coronal hole features. From 1972 May to 1973 October, daily measures were obtained of the coronal hole area appearing at the central solar meridian. Autocorrelations of the coronal-hole-area time series in seven latitude zones provide synodic rotation periods which indicate a close to rigid rotation by such features for lag lengths of only one rotation. For latitudes below about 50 deg, both the autocorrelation functions for short-lived coronal holes and analyses of more persistent features over these 18 months suggest a quadrupolar distribution of coronal hole longitudes.

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