  Received: 1st December 2018; Accepted: 18th February 2019; Published: 1st
April 2019 Abstract: The calculated filling factors (FFs) for a feature reflect
the fraction of the solar disc covered by that feature, and the assignment of
reference synthetic spectra. In this paper, the FFs, specified as a function of
radial position on the solar disc, are computed for each image in a tabular
form. The filling factor (FF) is an important parameter and is defined as the
fraction of area in a pixel covered with the magnetic field, whereas the rest
of the area in the pixel is field-free. However, this does not provide
extensive information about the experiments conducted on tens or hundreds of
such images. This is the first time that filling factors for SODISM images have
been catalogued in tabular formation. This paper presents a new method that
provides the means to detect sunspots on full-disk solar images recorded by the
Solar Diameter Imager and Surface Mapper (SODISM) on the PICARD satellite. The
method is a totally automated detection process that achieves a sunspot
recognition rate of 97.6%. The number of sunspots detected by this method
strongly agrees with the NOAA catalogue. The sunspot areas calculated by this
method have a 99% correlation with SOHO over the same period, and thus help to
calculate the filling factor for wavelength (W.L.) 607nm.
