Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Filling Factors of Sunspots in SODISM Images

Amro F. Alasta 1 Abdrazag Algamudi 1 Fatma Almesrati 1 Mustapha Meftah 2 Rami Qahwaji 1 
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
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.
Complete list of metadata

Cited literature [19 references]  Display  Hide  Download
Contributor : Catherine Cardon Connect in order to contact the contributor
Submitted on : Wednesday, April 3, 2019 - 6:23:50 PM
Last modification on : Friday, December 3, 2021 - 11:42:51 AM


Publisher files allowed on an open archive



Amro F. Alasta, Abdrazag Algamudi, Fatma Almesrati, Mustapha Meftah, Rami Qahwaji. Filling Factors of Sunspots in SODISM Images. Annals of Emerging Technologies in Computing, International Association for Educators and Researchers (IAER), 2019, 3 (2), pp.1-13. ⟨10.33166/AETiC.2019.02.001⟩. ⟨insu-02089450⟩



Record views


Files downloads