A5069030717- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astronomy and Astrophysical Research
- Geomagnetism and Paleomagnetism Studies
- Astronomical Observations and Instrumentation
- Particle Accelerators and Free-Electron Lasers
- Spacecraft Dynamics and Control
- Earthquake Detection and Analysis
- Planetary Science and Exploration
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Distributed and Parallel Computing Systems
- Space Satellite Systems and Control
- Spacecraft Design and Technology
- GNSS positioning and interference
- Scientific Research and Discoveries
- Remote Sensing and LiDAR Applications
- Radio, Podcasts, and Digital Media
- Hedgehog Signaling Pathway Studies
- Space Science and Extraterrestrial Life
Centro Hospitalar de Vila Nova de Gaia
2024
Universidade do Porto
2003-2024
UK Astronomy Technology Centre
2018
Centro de Estudos em Geografia e Ordenamento do Territorio
2006
Chinese Academy of Sciences
2006
National Astronomical Observatories
2006
European Space Research and Technology Centre
2005
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2003-2005
Janssen (France)
2005
Observatoire de Paris
1998-2003
We observed the fast coronal mass ejection (CME) of 1998 April 20 with radioheliograph at Nançay, France, between 164 and 432 MHz. Spectroscopic data were obtained 40 800 MHz by spectrometer Tremsdorf, Germany, kHz 14 WAVES instrument on board Wind spacecraft. Energetic particle from 3D Plasma Particle experiment. The CME was in white light Large-Angle Spectrometric COronagraph experiment Solar Heliospheric Observatory For first time, expanding loops are imaged directly radio wavelengths....
A halo coronal mass ejection (CME) was observed at 15:03 UT on 1998 May 2 by the Solar and Heliospheric Observatory Large-Angle Spectrometric Coronagraph. The observation of CME preceded a major soft X-ray flare in NOAA Active Region 8210, characterized delta spot magnetic configuration some activity region 8214. large transequatorial interconnecting loop (TIL) seen X-rays connected AR 8210 to faint field periphery Smaller systems were also connecting other fainter bipolar structures, (IL)...
As the largest radio telescope in world, Square Kilometre Array (SKA) will lead next generation of astronomy. The feats engineering required to construct array be matched only by techniques developed exploit rich scientific value data. To drive forward development efficient and accurate analysis methods, we are designing a series data challenges that provide community with high-quality datasets for testing evaluating new techniques. In this paper present description results from first such...
Introdução: A demência, uma condição neurodegenerativa crescente, impacta negativamente a qualidade de vida dos idosos. prevalência da doença está aumentando globalmente, gerando desafios significativos para saúde pública. Estudos têm sugerido que prática regular exercícios físicos pode beneficiar cognitiva Objetivo: Investigar os efeitos aeróbicos, resistência e flexibilidade na progressão demência em idosos, identificando quais modalidades são mais eficazes retardar promover melhorias...
The Square Kilometre Array (SKA) Observatory is gearing up the formal construction of its two radio interferometers in Australia and South Africa after end design pre-construction phases. Agile methodologies, Cloud native Computing technologies DevOps software ideas are influencing compute infrastructures that will be key to reduce operational costs SKA while improving control monitoring antennas ancillary systems, Correlators, HPC facilities or related data centre tiered systems. These...
The renewed global interest in lunar exploration requires new orbital strategies to ensure flight safety which can benefit extended missions and service a plethora of planned instruments the orbit surface. We investigate here equivalent fuel consumption cost transfer from (to) given enter (leave) at any point an invariant manifold associated with Lyapunov around Earth-Moon $L_1$ Lagrangian using bi-impulsive maneuvers. Whereas solving this type is generally computationally expensive, we...
On 2001 April 15, the Nançay radioheliograph observed fast-moving, expanding loops in images taken wavelength range between 164 and 432 MHz. We were able to follow progression of radio loops, starting from a few tenths more than 1 R☉ above solar limb, with time cadence order seconds. The seen agree very well features coronal mass ejection (CME) later, 2.5 white-light by Large Angle Spectrometric Coronagraph (LASCO) experiment on board Solar Heliospheric Observatory (SOHO) spacecraft. event...
We present observational imaging evidence for the existence of metric radio bursts closely associated with front edge coronal mass ejections (CMEs). These drift in frequency similarly to type II bursts. They are weak and usually go undetected on spectrograph data. find same measured projected velocity displacement of, respectively, source (when observed at two or more frequencies) CME leading edge. The position emitting coincides Among events analyzed, fastest them, a over 1400 km s-1, was...
The Oporto radiospectrograph and the Nançay radioheliograph recorded a radio event on November 6, 1997, closely related in time with flare National Oceanic Atmospheric Administration (NOAA) active region 8100. At beginning of sources are located rather small volume vicinity site. In timescale only few minutes emission sites spread over large corona, covering range 100° heliolatitude. During period Large Angle Spectrometric Coronagraph (LASCO) board Solar Heliospheric Observatory (SOHO)...
We revisit the impulsive beamlike particle events detected in situ from 1997 to 2000 by Electron, Proton, and Alpha Monitor (EPAM) experiment on Advanced Composition Explorer spacecraft. study detail a subset of for which there are radio coronal observations Nançay Radioheliograph. EPAM measures electrons energy range 40 300 keV over wide look directions with better than 1 minute time resolution, while radioheliograph provides images solar corona at five different frequencies cadence eight...
We present a detailed study of complex solar event observed on 2002 June 2. Joint imaging EUV, X-ray, and multiwavelength radio observations allow us to trace the development magnetic structure involved in this up radial distance order 2 R☉. The involves type II, III, IV bursts. burst is formed by two sources: fast-moving one (M) "quasi-stationary" (S). time coincidence flux peaks these sources underlying hard X-ray implies causal link. In first part our paper we provide summary without...
We present the evolution of Hα and radio emissions seen by Meudon telescope Nancay radioheliograph, which are associated with X17.2 flare halo CME 2003 October 28. The remarkable characteristic this event is its spatial extent that it reached in a few minutes. At 164 MHz, images show emission covers whole disk Sun extends as far 1.8 R☉ from Sun's center. emissions, Moreton wave Hα, all similar temporal development, three phenomena likely to be related. multifrequency imaging observations...
In the framework of Portuguese radio astronomical capacitation towards participation in Square Kilometer Array (SKA) project, a site was selected for testing purposes and development infrastructure. The is within Herdade da Contenda (HC), large national forest perimeter, located Alentejo (Portugal). order to minimize impacts ecosystem landscape, an application based on Geographic Information System (GIS) open source environment created, HC Environmental Integrated Management System. This...
Using multi-wavelength observations, in particular imagery, recorded by SOHO/LASCO-MDI, Yohkoh/SXT, the Meudon spectroheliograph and Nançay radioheliograph, performing a linear force-free field extrapolation, we analyzed triggering development of complex eruptive event chromosphere corona. This included an X1 class flare filament within active region, but it also involved whole spanning over 40 degrees heliolongitude. It resulted fast decelerating partial halo CME, associated with Moreton...
The properties of the coronal mass ejections (CMEs) observed by Large Angle and Spectrometric Coronagraph Experiment (LASCO) on Solar Heliospheric Observatory (SOHO) spacecraft are kept in an online catalog that has been widely used a series analyses individual events statistical overviews CME properties. A subject some these studies problem acceleration, particular differences between accelerated decelerated events. impact measurement errors acceleration is issue mostly overlooked such...
A modeling framework for the prediction of Martian radiation environment is presented. Features include input solar cycle modulated cosmic ray and particle event spectra, based both on CREME-96, transport this in atmosphere regolith, including creation secondaries, using Geant4 Monte Carlo toolkit. Details are derived from European Mars Climate Database with a dense topological grid layering atmosphere. Seasonal diurnal variations considered. Surface topology Orbiter Laser Altimeter (MOLA)...
The use of GPS positioning and navigation capabilities in mobile phones is present our daily lives for more than a decade, but never with the centimeter level precision that can actually be reached several most recent smartphones. introduction new GNSS systems (Global Navigation Satellite Systems), European system Galileo, opening horizons wide range areas rely on precise georeferencing, namely mass market smartphones apps. constant growth this has brought devices innovative hardware...