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Nomenclatura Unesco > (21) Astronomía y Astrofísica

Mostrando recursos 41 - 60 de 586

41. Perfis de Densidade de Matéria na Redondeza Solar - Aguiar, Gabriel Corrêa de

42. Algoritmo para extração fotométrica nos dados do ESO-VVV: o aglomerado estelar massivo Pismis 24 - Dias, Rafael Augusto Garcia

43. Determinação do campo magnético de estrelas anãs brancas através do efeito Zeeman quadrático - Wilsmann, Karin Wittmann

44. Caracterização das cordas cósmicas girantes a partir da modelagem pela teoria de gravitação de Brans-Dicke - Silva, Renan Floriano da

45. Classificação Espectral de Anãs Brancas - Ourique, Gustavo

46. Mached Filter na Detecção de Caudas de Maré - Queiroz, Anna Barbara de Andrade

47. Revista Mexicana de Astronomía y Astrofísica : Universidad Nacional Autónoma de México. Instituto de Astronomía

48. Mathematical Methods Applied to the Celestial Mechanics of Artificial Satellites 2013 - Prado, Antonio F. Bertachini A.; Masdemont Soler, Josep; Zanardi, Maria Cecilia; Winter, Silvia Maria Giuliatti; Yokoyama, Tadashi; Gomes, Vivian Martins
Postprint (published version)

49. Mathematical Methods Applied to the Celestial Mechanics of Artificial Satellites 2013 - Prado, Antonio F. Bertachini A.; Masdemont Soler, Josep; Zanardi, Maria Cecilia; Winter, Silvia Maria Giuliatti; Yokoyama, Tadashi; Gomes, Vivian Martins
Postprint (published version)

50. Lagrange y la primera formulación de la mecánica analítica - Navarro, Luis

51. Solar EUV flux rate estimation during mid and strong flares from the ionospheric electron content response signature in GNSS observations - Hernández Pajares, Manuel; García Rigo, Alberto; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Monte Moreno, Enrique; Aragón Ángel, María Ángeles
A simple and precise technique to measure the sudden Extreme Ultraviolet (EUV) radiation increase of the Sun, during mid and strong flares, has been formulated and demonstrated for the most active part of the last Solar Cycle. On the one hand, it is based on the short time scale of these events, which allows the validity of a simple global overionization model. And on the other hand on the prompt ionospheric response to the EUV ionization, which signature (in terms of the Global Navigation Satellite Systems -GNSSSolar Flare Activity Indicator, GSFLAI) is accurately measured in real-time from the existing global...

52. Solar EUV flux rate estimation during mid and strong flares from the ionospheric electron content response signature in GNSS observations - Hernández Pajares, Manuel; García Rigo, Alberto; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Monte Moreno, Enrique; Aragón Ángel, María Ángeles
A simple and precise technique to measure the sudden Extreme Ultraviolet (EUV) radiation increase of the Sun, during mid and strong flares, has been formulated and demonstrated for the most active part of the last Solar Cycle. On the one hand, it is based on the short time scale of these events, which allows the validity of a simple global overionization model. And on the other hand on the prompt ionospheric response to the EUV ionization, which signature (in terms of the Global Navigation Satellite Systems -GNSSSolar Flare Activity Indicator, GSFLAI) is accurately measured in real-time from the existing global...

53. Impact of higher order ionospheric delay on precise GNSS computation - Hernández Pajares, Manuel; Aragon Angel, Maria Angeles; Defraigne, Pascale; Bergeot, Nicolas; Prieto Cerdeira, Roberto; Sanz Subirana, Jaume
Peer Reviewed

54. Impact of higher order ionospheric delay on precise GNSS computation - Hernández Pajares, Manuel; Aragon Angel, Maria Angeles; Defraigne, Pascale; Bergeot, Nicolas; Prieto Cerdeira, Roberto; Sanz Subirana, Jaume
Peer Reviewed

55. The shape of a galaxy is not much influenced by the potential as it might seem - Cubarsí Morera, Rafael
The dynamics of a galaxy as a stellar system in statistical equilibrium is usually obtained from the superposition principle, based on the linearity of the Boltzmann collisionless equation (BCE) in regard to the phase space density function. The term statistical equilibrium is a notion coming from statistical dynamics, although, from an analytical dynamics viewpoint, it should be associated with an invariant (conservative) density function under the BCE in the phase space. Similarly, dissipative forces like dynamical friction, which are essential to statistical dynamics, emerge in analytical dynamics via non steady-state phase density functions and/or potentials as solutions of the BCE....

56. The shape of a galaxy is not much influenced by the potential as it might seem - Cubarsí Morera, Rafael
The dynamics of a galaxy as a stellar system in statistical equilibrium is usually obtained from the superposition principle, based on the linearity of the Boltzmann collisionless equation (BCE) in regard to the phase space density function. The term statistical equilibrium is a notion coming from statistical dynamics, although, from an analytical dynamics viewpoint, it should be associated with an invariant (conservative) density function under the BCE in the phase space. Similarly, dissipative forces like dynamical friction, which are essential to statistical dynamics, emerge in analytical dynamics via non steady-state phase density functions and/or potentials as solutions of the BCE....

57. UV to far-IR reflectance spectra of carbonaceous chondrites - I. Implications for remote characterization of dark primitive asteroids targeted by sample-return missions - Trigo-Rodríguez, José María; Moyano Cambero, Carles E.; Llorca Piqué, Jordi; Fornasier, Sonia; Barucci, Maria Antonietta; Belskaya, Irina N.; Martins, Zita; Rivkin, Andrew S.; Dotto, Elisabetta; Madiedo, José María; Alonso Azcárate, Jacinto
We analyse here a wide sample of carbonaceous chondrites from historic falls (e.g. Allende, Cold Bokkeveld, Kainsaz, Leoville, Murchison, Murray, Orgueil and Tagish Lake) and from NASA Antarctic collection.With the analysis of these meteorites we want to get new clues on the role of aqueous alteration in promoting the reflectance spectra diversity evidenced in the most primitive chondrite groups. The selected meteorite specimens are a sample large enough to exemplify how laboratory reflectance spectra of rare groups of carbonaceous chondrites exhibit distinctive features that can be used to remotely characterize the spectra of primitive asteroids. Our spectra cover the full electromagnetic spectrum from 0.2 to 25 μm...

58. UV to far-IR reflectance spectra of carbonaceous chondrites - I. Implications for remote characterization of dark primitive asteroids targeted by sample-return missions - Trigo-Rodríguez, José María; Moyano Cambero, Carles E.; Llorca Piqué, Jordi; Fornasier, Sonia; Barucci, Maria Antonietta; Belskaya, Irina N.; Martins, Zita; Rivkin, Andrew S.; Dotto, Elisabetta; Madiedo, José María; Alonso Azcárate, Jacinto
We analyse here a wide sample of carbonaceous chondrites from historic falls (e.g. Allende,Cold Bokkeveld, Kainsaz, Leoville, Murchison, Murray, Orgueil and Tagish Lake) and fromNASA Antarctic collection.With the analysis of these meteorites we want to get new clues onthe role of aqueous alteration in promoting the reflectance spectra diversity evidenced in themost primitive chondrite groups. The selected meteorite specimens are a sample large enoughto exemplify how laboratory reflectance spectra of rare groups of carbonaceous chondritesexhibit distinctive features that can be used to remotely characterize the spectra of primitiveasteroids. Our spectra cover the full electromagnetic spectrum from 0.2 to 25 μm...

59. Time calibration and search for cosmic sources of high energy neutrinos with the ANTARES neutrino telescope - Gómez-González, Juan Pablo
La astronomía de neutrinos, un campo experimental de la astrofísica de partículas relativamente joven, se propone la observación de los fenómenos más energéticos del universo utilizando neutrinos como mensajeros cósmicos. La motivación principal a la hora de construir un telescopio de neutrinos proviene de las incógnitas existentes sobre el origen y la producción de los rayos cósmicos de más alta energía. Sospechamos que dicha radiación cósmica sea el resultado de procesos de aceleración en escenarios astrofísicos, sin embargo, debido a la pérdida de la direccionalidad de estas partículas por la acción de campos magnéticos inter-estelares durante su propagación, no existe...

60. Development of the Detector Tray for the Wide Field Monitor of the Large Observatory For x-ray Timing (LOFT), a medium-class candidate mission in ESA´s Cosmic Vision 2015-2025. - Karelin, Dmitry
LOFT, the Large Observatory For X-ray Timing, has recently pass the ESA call as one of the four M3 mission candidates that will complete for a launch opportunity at the start of the 2020s. The primary goal of the mission is to study strongfield gravity, black hole masses and spins, and the equation of state of ultra-dense matter via high-time-resolution X-ray observations of compact objects. Two instruments will be comprised in the scientific payload of LOFT: the Large Area Detector (LAD) a 12 m2 collimated Xray detector in the 2-30 keV range, with unprecedented timing capabilities, and the Wide Field...

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