13 documents found, page 1 of 2
Updating datasets of ionospheric parameters provided by SCINDA GNSS receiver fr...
Morozova, A. L.; Barlyaeva, Tatiana; Barata, TeresaAn updated dataset based on data from a GNSS receiver with the SCINDA software installed in Lisbon airport area are presented: the new dataset cover the entire time interval from December 2014 to February 2019, except for the original SCINDA data for 2015, which can be found in the original version of the paper. The dataset consists of 2 parts: (1) data produced by SCINDA; (2) processed data. The types of the d...
Ionosphere over Eastern North Atlantic Midlatitudinal Zone during Geomagnetic S...
Barata, Teresa; Pereira, Joana; Hernández-Pajares, Manuel; Barlyaeva, Tatiana; Morozova, A. L.The ionospheric response at middle latitudes to geomagnetic storms is not yet very well understood. Total electron content (TEC) variations associated with eight strong geomagnetic storms between 2015 and 2022 obtained from GNSS receivers in the eastern area of the North Atlantic (Portuguese continental and insular territory) are studied in an attempt to fill this gap. It was found that for most of the studied ...
Sunspot Detection Using YOLOv5 in Spectroheliograph H-Alpha Images
Santos, José; Peixinho, Nuno; Barata, Teresa; Pereira, Carlos; Coimbra, A. Paulo; Crisóstomo, Manuel M.; Mendes, MateusSolar activity has been subject to increasingly more research in the last decades. Its influence on life on Earth is now better understood. Solar winds impact the earth’s magnetic field and atmosphere. They can disrupt satellite communication and navigation tools and even electrical power grids and several other infrastructure crucial for our technology-based society. Coronal mass ejections (CMEs), solar energe...
Total Electron Content PCA-NN Prediction Model for South-European Middle Latitudes
Morozova, A. L.; Barata, Teresa; Barlyaeva, Tatiana; Gafeira, RicardoA regression-based model was previously developed to forecast total electron content (TEC) at middle latitudes. We present a more sophisticated model using neural networks (NN) instead of linear regression. This regional model prototype simulates and forecasts TEC variations in relation to space weather conditions. The development of a prototype consisted of the selection of the best set of predictors, NN archi...
PCA-MRM Model to Forecast TEC at Middle Latitudes
Morozova, Anna L.; Barata, Teresa; Barlyaeva, Tatiana V.The total electron content (TEC) over the Iberian Peninsula was modelled using PCA-MRM models based on decomposition of the observed TEC series using the principal component analysis (PCA) and reconstruction of the daily modes’ amplitudes by a multiple linear regression model (MRM) using space weather parameters as regressors. The following space weather parameters are used: proxies for the solar UV and XR flux...
Testing the Accuracy of Coimbra Astronomical Observatory Solar Filament Histori...
Lourenço, Ana; Gafeira, Ricardo; Bonifácio, Vitor; Barata, Teresa; Fernandes, João; Silva, EvaThe present work aims to validate the positions of solar filaments published in the Annals of Coimbra University Astronomical Observatory, currently the Geophysical and Astronomical Observatory of the University of Coimbra, corresponding to years 1929 to 1941. The published Stonyhurst positions were obtained by an original method devised in the early 20th century that used a spherical calculator instrument, a w...
Quo vadis, European Space Weather community?
Lilensten, Jean; Dumbović, Mateja; Spogli, Luca; Belehaki, Anna; Van der Linden, Ronald; Poedts, Stefaan; Barata, Teresa; Bisi, Mario M.This paper was written by a group of European researchers believing that now is the right time to frame the Space Weather and Space Climate discipline in Europe for future years. It is devoted to openly discussing the organisation and sustainability of the European Space Weather community and its assets in the (near) future. More specifically, we suggest that the European Space Weather community lacks a uniting...
Testing the accuracy of Coimbra Astronomical Observatory Solar Filament Histori...
Lourenço, Ana; Gafeira, Ricardo; Bonifácio, Vitor; Barata, Teresa; Fernandes, João; Silva, EvaThe present work aims to validate the positions of solar filaments published in the Annals of Coimbra University Astronomical Observatory, currently the Geophysical and Astronomical Observatory of the University of Coimbra, corresponding to years 1929 to 1941. The published Stonyhurst positions were obtained by an original method devised in the early 20th century that used a spherical calculator instrument, a w...
Datasets of ionospheric parameters provided by SCINDA GNSS receiver from Lisbon...
Barlyaeva, Tatiana V.; Barata, Teresa; Morozova, Anna L.arXiv admin note: text overlap with arXiv:1910.04044; Here we present datasets provided by a SCINDA GNSS receiver installed in the Lisbon airport area from November of 2014 to July of 2019. The installed equipment is a NovAtel EURO4 with a JAVAD Choke-Ring antenna. The data are in an archived format and include the general messages on quality of records (*.msg), RANGE files (*.rng), raw observables as the signa...
Solar observations at the Coimbra Astronomical Observatory
Lourenço, Ana; Carvalho, Sara; Barata, Teresa; Garcia, Adriana; Carrasco, Víctor; Peixinho, NunoIn 2020, the Geophysical and Astronomical Observatory of the University of Coimbra will celebrate the 95th anniversary of its first spectroheliographic observation. Keeping a daily service of solar observations since then, making almost a century, led to one of the largest continuous solar data collections in the world. This long–term solar database is essential for studies where solar activity is involved. Thi...