Publications
We analysed a GOES C6.2 class solar flare that occurred on 27 October 2003 at the heliographic position S20E29. Utilising a database developed from a simplified 3D magnetic loop model, we inferred a set of geometric and physical parameters to characterise the flare.This model, based on general properties of known
Solar radio bursts are characterised by intense electromagnetic radiation emitted from the Sun’s atmosphere releasing huge amounts of energy in the order of ∼ 10 32 ergs and are crucial indicators of solar activity. These burst events might drive extreme space weather phenomena such as geomagnetic storms, ionospheric disturbances, and
One of the fundamental questions in astronomy is how galaxies form and evolve through cosmic time. For the past few decades, various teams have been trying to answer this question through the construction of computational models for simulated galaxies and their associated active galactic nuclei (AGN). With the next generation
The RAEGE network (Portuguese/Spanish acronym for Atlantic Network of Geodynamic and Space Stations) is a cooperation project between the National Geographic Institute of Spain and the Regional Government of the Azores. The project will build and operate four geodetic stations: two in the Azores archipelago, in Portugal (Santa Maria and
We analyzed a GOES C6.2 class flare on 27 October 2003 on the heliographic position S20E29. Based on the essential parameters of its microwave emission, we inferred a set of geometric and physical parameters to characterize a solar flare using a developed database of a simplified model of a 3D
The conventional International Terrestrial Reference Frame (ITRF) is based on the combination of solutions from several space geodetic techniques, including observations until the end of 2020, and incorporates updated data and models. In contrast, the Celestial Reference Frame (CRF) is a VLBI-only solution based on data until 2015. These differing
The Global Geodetic Observing System (GGOS) of the International Association of Geodesy (IAG) envisages stringent goals for the International Terrestrial Reference Frame (ITRF) realization in terms of accuracy (1 mm) and precision (0.1 mm/year). These requirements entail that the Earth Orientation Parameters (EOP) should be estimated with similar accuracy. The
The RAEGE project (Portugues/Spanish acronym for Atlantic Network of Geodynamic and Space Stations) is a cooperation project established between the Government of Spain and the Regional Government of the Azores that intends the construction and operation of 4 fundamental space geodetic stations: 2 in Spain (Yebes and Gran Canaria) and
General description of RAEGE network, the stations and its activities taking a closer look to the RAEGE Station of Santa Maria, an island in the North-Atlantic Ocean. João S. Ferreira[1] Type Presentation Event GGOS Affiliate Japan Annual Meeting 2023 [1] Estação RAEGE de Santa Maria, Associação RAEGE Açores, Santa Maria –
The RAEGE Station of Santa Maria, located in the Azores archipelago (Portugal), is one of the four stations of the RAEGE Network. As an highlight for this period one shall mention the installation of the new VGOS broadband receiver, the determination of the local tie pillars position and the recurring
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