24 citations · 36 across the 8 of their papers we have counts for
4 papers · 1 filter
Scrutinizing the relationship between plage areas and sunspot areas and numbers
Theodosios Chatzistergos, Ilaria Ermolli, Natalie A. Krivova +3
Studies and reconstructions of past solar activity require data on sunspots as well as faculae/plage and network. Such data are also important for understanding the magnetic activi…
Testing the accuracy of Coimbra Astronomical Observatory solar filament historical series (1929-1941)
Ana Lourenço, Ricardo Gafeira, Vitor Bonifacio +3
The present work aims to validate the positions of solar filaments published in the Annals of Coimbra University Astronomical Observatory, currently the Geophysical and Astronomica…
Comparison of automatic methods to detect sunspots in the Coimbra Observatory spectroheliograms
S. Carvalho, S. Gomes, T. Barata +2
The Astronomical Observatory of the University of Coimbra has a huge collection of solar images, acquired daily since 1926. From the beginning, only spectroheliograms in the CaiiK…
Software tool for automatic detection of solar plages in the Coimbra Observatory spectroheliograms
T. Barata, S. Carvalho, I. Dorotovic +4
Full-disk spectroheliograms have been taken in Coimbra on a daily basis since 1926 in the Ca II K-line (K1 and K3). Later, in 1989, with the upgrade of the equipment it was possibl…