Solar distortion measurements

Highly accurate solar limb temperature and shape observations were obtained from Mt Wilson using a highly specialized telescope. The solar oblateness appears to fluctuate on a time scale of years. A latitude dependent solar limb temperature variation exists with a temperature amplitude of about 0.6k. This temperature variation is independent of the solar cycle. Oblateness of the Sun in 1983 and Relativity; On the Facular Contrast Near the Solar Limb; Brightness Variation; Another Reason to Search for Solar g-Modes and New Limits from Solar Ellipticity Measurements; Solar Ellipticity Fluctuations Yield No Evidence of g-Modes; The Variable Oblateness of the Sun: Measurements of 1984; Is the Solar Oblateness Variable? Measurements of 1985; More Evidence for a Solar Latitude Dependent Limb Temperature Variation.