Instituto Nacional de Pesquisas Espaciais

LIGO Detector Characterization in the Second and Third Parts of the Fourth Observing Run

Abstract LIGO detector characterization efforts enabled the confident detection of gravitational waves from hundreds of compact binary coalescences during the fourth observing run. Reliable production of high quality detector data and rapid noise mitigation efforts allow the extr...

HiClim-SA: Building a High-Resolution Climate Projection Dataset for South America—Part I: CMIP6 Model Selection

High-resolution climate projection datasets for South America require careful model selection, since regional climate depends on interacting atmospheric systems across multiple scales. Consequently, evaluations based only on statistical metrics may fail to determine whether model...

The Spectral Energy Distribution of QR And : Preliminary Analysis

ABSTRACT We present a preliminary multiwavelength spectral energy distribution (SED) analysis of the Galactic supersoft X‐ray source QR Andromedae (QR And). The longer‐wavelength portion, spanning from the ultraviolet to the infrared, was built from compiled archival and catalogu...

Methodology for Monitoring Natural Vegetation Loss in the Pantanal Biome Using Medium Spatial Resolution Imagery

The Pantanal features complex vegetation in terms of physiognomy; its original cover is increasingly replaced by agricultural and livestock land use. Given its importance and the resulting impacts on biodiversity and the physical environment, the biome was included in the Brazili...

Shifting Patterns of Precipitation Extremes in the S outheast A tlantic Basin— B razil: From Observed Trends to Future Projections

ABSTRACT Understanding the variability and evolution of precipitation extremes associated with climate change is essential to support adaptation strategies, risk management, and civil protection. In this context, this study investigates the climatology, observed trends, and futur...

Spatially explicit modeling of future land use and land cover dynamics in the São Francisco River Basin, Brazil

Future land use and land cover (LULC) changes in major Brazilian river basins may pose substantial challenges for water resource management by altering streamflow regimes, reducing water availability, affecting ecosystem services, and increasing pressure on vulnerable hydrologica...

Beyond Accuracy: A Computational–Robustness Comparison of Point Cloud Registration Algorithms

The digital documentation of cultural heritage increasingly relies on the fusion of multi-source data to overcome the limitations of individual sensors. This study evaluates the performance of four registration algorithms, Iterative Closest Point (ICP), RANSAC, Fast Global Regist...

Land transformation driven by wind and solar development in Brazilian municipalities

Abstract In the last decade, Brazil’s energy sector has been moved from an exclusively hydroelectric and thermal mix to incorporate large-scale production of wind and solar photovoltaic energy. This energy transition is synchronized with the global imperative to reduce greenhouse...

Persistent spatial hotspots and socioeconomic inequalities of snakebite envenoming in Peru: A nationwide spatiotemporal analysis, 2010–2025

Background Snakebite envenoming remains a major neglected tropical disease worldwide, disproportionately affecting rural and socioeconomically vulnerable populations in tropical and subtropical regions. In Peru, snakebite burden is strongly concentrated in Amazonian territories,...

Western amazon 2020 extreme heatwave

Abstract Between September and November 2020, an extreme climate event characterized by the co-occurrence of severe drought, extreme heat stress, widespread burning, and respiratory health impacts affected southwestern Amazonia. This study investigated the event using an integrat...

Rapid increase of climate extremes reveals new areas of concern in Amazonia

Abstract Amazonia is highly sensitive to climate extremes, yet we lack an Amazon-wide assessment that examines the spatial-temporal changes in these extreme conditions. We address this within seasons and across the hydrological year, using a quantiles approach that integrates the...

Regional assessment of atmospheric CO₂, CH₄ and CO concentrations in Southern Brazil using WRF-Chem under present and energy transition scenarios

Abstract The objective of this study was to evaluate the spatial and temporal distribution of greenhouse gases (CO₂ and CH₄) and the atmospheric pollutant CO in Santa Catarina, Brazil, and to analyze the impacts of energy transition scenarios on their atmospheric concentrations....

Intelligent Steel Surface Defect Segmentation for Edge-Oriented IIoT Quality Control

Automated surface defect detection in hot-rolled steel is a prerequisite for real-time quality control, yet most deployed inspection systems operate in isolation from Industrial Internet of Things (IIoT) infrastructure. This paper reports a laboratory-scale proof of concept with...

A micronova burst in the intermediate polar IGR J17014-4306

Abstract We report the detection of a short optical burst in TESS data of IGR J17014-4306, the eclipsing intermediate polar with the longest known orbital period. The burst lasts 1.56 d and shows multiple peaks, reaching (9.3 ± 0.2) × 1033 erg s−1, and releases a total energy of...

A compilation of global bio-optical in situ data for ocean-colour satellite applications – version four

Abstract. A global in situ dataset for validation of satellite products from the ESA Ocean Colour Climate Change Initiative (OC-CCI) is presented. This version of the compilation, with data starting in 1996, extends to 2025, which is important for the validation of recent algorit...

Impacts of droughts on biomass burning emissions, air quality, and public health in the Amazon

Abstract. Wildfires in the Amazon, increasingly influenced by climate variability and anthropogenic activities, pose severe environmental and health challenges. While drought events amplify fire activity and emissions, the cascading effects of droughts and deforestation on air qu...

A near-sunset atmospheric sounding during the 14 October 2023 annular solar eclipse over Natal

Abstract. Solar eclipses are transient atmospheric events that cause rapid localized reduction in solar radiation, which produces complex changes associate with the vertical coupling of the layers. This study investigates the vertical response of the neutral atmosphere to the 14...