Buscar
Mostrando ítems 1421-1430 de 4544
Proposta de um Algoritmo para o Cálculo da Declinação Magnética a partir do Mapa Magnético Digitalizado
(Instituto de Geociências /Universidade Federal do Rio Grande do Sul, 1997)
A multiwavelength study of the ring nebula SG 13
(Wiley Blackwell Publishing, Inc, 2009-05)
We investigate the morphology and kinematics of the interstellar medium in the environs of the open cluster Mrk 50, which includes the Wolf–Rayet star WR 157 and a number of early B-type stars. The analysis was performed ...
Oxygen Abundance in Coronal Streamers
(IOP Publishing, 2005-12)
In a previous work we developed a stationary proton-electron MHD model of the solar corona, suitable for the minimum-activity epochs. In the present work, we use empirically derived information from the past solar minimum ...
Did EGRET detect distant supernova remnants?
(Elsevier, 2004-12)
It might be thought that supernova remnants (SNRs) more distant than a few kiloparsec from Earth could not have been detected by the high-energy c-ray experiment EGRET on board of NASA s Compton Gamma-Ray Observatory. This ...
Caracterización de fibers a frecuencia fija en la radio emisión solar. Criterio para su selección
(2013)
A partir de observaciones con alta resolución temporal (10 ms) a frecuencia fija de la radio emisión solar, se propone un procedimiento para la selección de eventos fibers. Las observaciones fueron realizadas con el ...
Estudo da variabilidade da aeroluminescência noturna na alta atmosfera terrestre
(Universidade Federal de Santa MariaCentro de Ciências Naturais e Exatas, 2008-12-18)
This work intends to study the airglow emissions in the Earth's upper atmosphere, between 70 and 300 km of altitude. The study implies a physical understanding of the processes involving airglow phenomenology and its ...
Aplicação de mineração de dados na avaliação da relação entre tempestades geomagnéticas e muons
(Universidade Federal de Santa MariaBrasilUFSMCentro de Tecnologia, 2011-12-15)
The geomagnetic storms have been a recurring subject of study in the area of Space Weather, due to the consequences that they, in large amounts, can bring to the Earth‟s surface. Coronal Mass Ejections are potential causes ...
Periodicidades no fluxo de raios cósmicos e análise de choques interplanetários
(Universidade Federal de Santa MariaCentro de Ciências Naturais e Exatas, 2010-01-08)
Muons and neutrons that reach the Earth surface with high energy constitute a particles’ group called secondary cosmic rays. In order to study the flux of this particles data from muons and neutrons stations are used. The ...
A search for point sources of eev neutrons
(Brasil, 2012)
A thorough search of the sky exposed at the Pierre Auger Cosmic Ray Observatory reveals no statistically significant excess of events in any small solid angle that would be indicative of a flux of neutral particles from a ...
Measurement of the Depth of Maximum of Extensive Air Showers above 1018 eV
(2010-03-05)
We describe the measurement of the depth of maximum, Xmax, of the longitudinal development of air showers induced by cosmic rays. Almost 4000 events above 1018 eV observed by the fluorescence detector of the Pierre Auger ...