129 research outputs found
A stable auroral red arc over Europe
No full textUsing a new all-sky-imaging system, M Mendillo, C Barbieri, J Baumgardner, J Wroten, G Cremonese and G Umbriaco observed two distinctive types of aurora over London and western Europe on the night of 26-27 September 2011, including the first ground-based image of a stable auroral red arc over Europe. 2012 Royal Astronomical Society
A stable auroral red arc over Europe
No full textUsing a new all-sky-imaging system, M Mendillo, C Barbieri, J Baumgardner, J Wroten, G Cremonese and G Umbriaco observed two distinctive types of aurora over London and western Europe on the night of 26-27 September 2011, including the first ground-based image of a stable auroral red arc over Europe
ALLINEAMENTO OTTICO DEL TELESCOPIO VST (VLT SURVEY TELESCOPE)
No full textSi presenta il lavoro di allineamento ottico del telescopio per survey VST installato in Cile, le modalità di allineamento, l'analisi di immagini, per ottenere un campo di vista 1°x1° totalmente corretto da aberrazioni ottich
Observation of non-specular effects for Gaussian-Schell model light beams
No full textWe investigate experimentally the role of spatial coherence on optical beam shifts. This topic has been the subject of recent theoretical debate. Our data unambiguously resolve the theoretical debate in favour of one specific theory
Observation of nonspecular effects for Gaussian Schell-model light beams
No full textWe investigate experimentally the role of spatial coherence on optical beam shifts. This topic has been the subject of recent theoretical debate. We consider Gaussian Schell-model beams, with different spatial degrees of coherence, reflected at an air-glass interface. We prove that the angular Goos-Hanchen and the angular Imbert-Fedorov effects are affected by the spatial degree of coherence of the incident beam, whereas, the spatial Goos-Hanchen effect does not depend on incoherence. Our data unambiguously resolve the theoretical debate in favor of one specific theory
Role of spatial coherence in the Goos-Hänchen shift
No full textAmongst the various nonspecular phenomena that affect the reflection of a beam of light by a smooth surface, the Goos-Hänchen (GH) shift is certainly the most investigated one. Experimental studies of this effect have been performed so far only with fully spatial coherent beams. © 2013 IEEE
Observation of nonspecular effects for Gaussian Schell-model light beams
No full textWe investigate experimentally the role of spatial coherence on optical beam shifts. This topic has been the subject of recent theoretical debate. We consider Gaussian Schell-model beams, with different spatial degrees of coherence, reflected at an air-glass interface. We prove that the angular Goos-Hänchen and the angular Imbert-Fedorov effects are affected by the spatial degree of coherence of the incident beam, whereas, the spatial Goos-Hänchen effect does not depend on incoherence. Our data unambiguously resolve the theoretical debate in favor of one specific theory. 2012 American Physical Society
Logbook of astronomical observation of Margherita Hack in Asiago Astrophysical Observatory
No full textLogbook of astronomical observation of Margherita Hack
part of paper:
"Margherita Hack’s Astrophysics at the Asiago Astrophysical Observatory"
Authors: G. Umbriaco, A. Bianchini, A. Pizzella, A. Siviero, G. Coran, P. Ochner, M. Montalto, M. Bazzicalupo, and P. Colasanto
Published: 2023
Abstract: Margherita Hack observed with the Galileo telescope at the Asiago Astrophysical Observatory from September 1951 to March 1954. Using the spectroscopic facilities of the observatory, Margherita contributed to the stellar study of novae, symbiotic stars, and peculiar stars. In the 80th anniversary of the Asiago Astrophysical Observatory and the 100th year of Margherita, we found her observations in the Asiago Photographic Plate Archive and we remade some Margherita’s observations with the current capabilities of Asiago telescopes. We present here a summary of the early studies carried out by Margherita with the Galileo telescope. We underline the importance of maintaining a well-organised plate archive to allow historical and scientifi c studies
Gaussian coronagraphic mask report and AIV procedure
No full textThe document outlines the testing and alignment procedures for the Gaussian coronagraphic mask used in the SHARK-NIR instrument, highlighting the critical role of these processes in enhancing the instrument's high-contrast imaging capabilities for astronomical observations. It details the challenges and solutions in achieving optimal alignment and performance, reflecting on the implications for future improvements in exoplanet discovery and study
Insertion and rotation alignment of the asymmetric SP Focal Plane mask in the wheel
No full textIt presents a detailed procedure for aligning focal plane masks within the SHARK-NIR instrument, showcasing the precision and technical requirements necessary for achieving optimal performance in high-contrast astronomical observation
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