Abstract:
A few methods of estimating Fried’s parameter (r˳) from specklegrams of solar features
are described. Some of these methods were used to estimate r˳ for the speckle data obtained from Kodaikanal Observatory (KO), Uttar Pradesh State Observatory (UPSO) and Udaipur Solar Observatory (USO). The average value of r˳ was found to be ~3 cm at USO and UPSO during our observations. At KO, values of r˳ ranging from 6 to 10 cm were estimated.
