Solar rotation as marked by extreme-ultraviolet coronal holes

Abstract

view Abstract Citations (60) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Solar rotation as marked by extreme-ultraviolet coronal holes. Wagner, W. J. Abstract 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. Publication: The Astrophysical Journal Pub Date: June 1975 DOI: 10.1086/181832 Bibcode: 1975ApJ...198L.141W Keywords: Autocorrelation; Far Ultraviolet Radiation; Solar Corona; Solar Rotation; Spectroheliographs; Line Spectra; Photosphere; Solar Atmosphere; Solar Magnetic Field; Solar Physics; Solar Physics full text sources ADS |