L. E. A. Vieira

Dataset and Code : Short-Term Forecasting of Total Solar Irradiance from Solar Disk Images

Idowu Raji, Rafael Santos, L. E. A. Vieira, Alejandro C. Frery

This record contains the dataset and source code for a research study on the short-term forecasting of Total Solar Irradiance. For a full description of the model, data processing, and usage instructions, please refer to the README.md file included in the zip …

br, Ouganda (code pays fourni par la source)

Peculiar Magnetosphere‐Atmosphere Coupling and Its Impacts Over the South American Magnetic Anomaly Region

L. A. Da Silva, Hui Li, Laysa C. A. Resende, V. F. Andrioli et autres

Abstract The auroral‐like sporadic E‐layer is typically observed at altitudes between 100 and 150 km within the South American Magnetic Anomaly region. However, the occurrence of an unusual layer event detected above this altitude range on 18 July 2017 has raised intriguing …

cn, br (code pays fourni par la source)

Magnetic Reconnection Ion Outflows Observed at the Dayside Magnetopause: Observation‐Model Comparison and Influence of Solar Wind Structures

Dustin Medeiros, V. M. Souza, Chi Wang, L. E. A. Vieira et autres

Abstract Magnetic reconnection is a fundamental process in magnetized plasmas that accelerates charged particles at the expense of magnetic energy. This study examines 122 dayside magnetopause crossing events characterized by accelerated ion plasma flows consistent with magnetic reconnection. We use in situ …

cn, br (code pays fourni par la source)

Extreme temporal clustering of solar flares in AR 13663/13664: magnetic topology and recurrence time in May 2024

Bruno Fernandes Garcia, Joaquim Eduardo Rezende Costa, L. E. A. Vieira, Alisson Dal Lago et autres

Solar Cycle 25’s most extreme episode occurred in early May 2024 when two magnetically complex active regions (AR 13663, AR 13664) generated 17 X-class flares in two weeks, driving G5 geomagnetic storms unseen since 2003. Using SDO/HMI SHARP vector magnetic indices and …

br (code pays fourni par la source)

Aprendizado de Máquina no Estudo de Explosões Solares:Um Panorama da Produção Científica Brasileira

Marcos William da Silva Oliveira, Tiago M. Ferrer, Paulo J. A. Simões, Marlos Rockenbah da Silva et autres

Este trabalho tem por objetivo apresentar a área de Física Solar, em especial o fenômeno de explosões solares, como oportuna para pesquisas futuras envolvendo aprendizado de máquina. Ocorre que extensos conjuntos de dados dessa área estão disponíveis e a produção científica brasileira …

Calibração polarimétrica baseada em varredura angular contínua para o GSST via caracterização de estados de polarização em sistema opto-mecânico

Edith Tueros Cuadros, F. L. Guarnieri, Franciele Carlesso, Alisson Dal Lago et autres

Esta nota técnica apresenta um procedimento didático e reprodutível de calibração polarimétrica baseada em varredura angular contínua em um sistema opto-mecânico do tipo PSG/PSA. O arranjo experimental é composto por uma fonte LED, difusor, polarizador linear, lâmina de quarto de onda de …

Magnetic Reconnection Ion Outflows Observedat the Dayside Magnetopause: Observation‐ModelComparison and Influence of Solar Wind Structures

Daniele da Silva Ferreira Medeiros, V. M. Souza, C. Wang, L. E. A. Vieira et autres

Magnetic reconnection is a fundamental process in magnetized plasmas that accelerates chargedparticles at the expense of magnetic energy. This study examines 122 dayside magnetopause crossing eventscharacterized by accelerated ion plasma flows consistent with magnetic reconnection. We use in situobservations from the Time …

Peculiar Magnetosphere-Atmosphere Coupling and Its Impacts Over the South American Magnetic Anomaly Region

Ligia Alves da Silva, Hui Li, L. C. A. Resende, V. F. Andrioli et autres

The auroral-like sporadic E-layer is typically observed at altitudes between 100 and 150 km within the South American Magnetic Anomaly region. However, the occurrence of an unusual layer event detected above this altitude range on 18 July 2017 has raised intriguing questions …

Simulação magnetohidrodinâmica de tempestades magnéticas

Nathan Mazzon Marquezin, L. E. A. Vieira, Flavia Reis Cardos Rojas, M. V. D. Silveira

O Sol possui um ciclo de atividade de 11 anos, com períodos de alta e baixa atividade solar. Durante os períodos de alta atividade solar, podem ocorrer ejeções de massa coronal (EMCs) intensas, as ejeções de partículas podem se tornar mais intensas …

Assessment of Daytime Sky Quality and Atmospheric Refractive Index ( C n 2 ) Analysis at Pico dos Dias Observatory

E. T. Cuadros, Adriano Almeida, Franciele Carlesso, David Pareja-Quispe et autres

Abstract Ground-based astronomical and solar observations are strongly influenced by atmospheric turbulence, a dynamic phenomenon that degrades optical resolution through refractive index fluctuations. This study evaluates daytime sky quality and the refractive index structure parameter ( C n 2 ) at the …

br, pe (code pays fourni par la source)

Space weather effects over SAMA during the extreme geomagnetic storm on May 10-11, 2024: disturbances of the neutral and ionized atmosphere

L. A. Da Silva, Jiankui Shi, L. R. Alves, L. C. A. Resende et autres

A complex active region in the Sun’s photosphere from 8 May 2024, produced seven halo-type Coronal Mass Ejections (CMEs) following extreme solar flares. These events generated Solar Energetic Particles (SEPs) that propagated toward Earth, culminating in an extreme geomagnetic storm (SYM-H = …

cn, br, us (code pays fourni par la source)

Classifying Safe Lunar Landing Sites Using Deep Learning and LRO Data

Luísa Santos, L. E. A. Vieira, Rafael Dantas dos Santos, Alisson Dal

In this study, we developed and implemented a deep learning program to classify the suitability of regions for landing on the Moon's south pole, utilizing data from NASA's Lunar Reconnaissance Orbiter (LRO), launched in 2009. The LRO mission, which included the creation …

br (code pays fourni par la source)