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Letteratura scientifica selezionata sul tema "Stars Scintillation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 gennaio 2023

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Articoli di riviste sul tema "Stars Scintillation"

1

Sofieva, V. F., V. Kan, F. Dalaudier, E. Kyrölä, J. Tamminen, J. L. Bertaux, A. Hauchecorne, D. Fussen, and F. Vanhellemont. "Influence of scintillation on GOMOS ozone retrievals." Atmospheric Chemistry and Physics Discussions 9, no. 3 (May 29, 2009): 12615–43. http://dx.doi.org/10.5194/acpd-9-12615-2009.

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Abstract. The stellar light passed through the Earth atmosphere is affected by refractive effects, which should be taken into account in retrievals from stellar occultation measurements. Scintillation caused by air density irregularities is a nuisance for retrievals of atmospheric composition. In this paper, we consider the influence of scintillation on stellar occultation measurements and on quality of ozone retrievals from these measurements, based on experience of the GOMOS (Global Ozone Monitoring by Occultation of Stars) instrument on board the Envisat satellite. In the GOMOS retrievals,

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2

Sofieva, V. F., V. Kan, F. Dalaudier, E. Kyrölä, J. Tamminen, J. L. Bertaux, A. Hauchecorne, D. Fussen, and F. Vanhellemont. "Influence of scintillation on quality of ozone monitoring by GOMOS." Atmospheric Chemistry and Physics 9, no. 23 (December 7, 2009): 9197–207. http://dx.doi.org/10.5194/acp-9-9197-2009.

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Abstract. Stellar light passing through the Earth atmosphere is affected by refractive effects, which should be taken into account in retrievals from stellar occultation measurements. Scintillation caused by air density irregularities is a nuisance for retrievals of atmospheric composition. In this paper, we consider the influence of scintillation on stellar occultation measurements and on the quality of ozone retrievals from these measurements, based on experience of the GOMOS (Global Ozone Monitoring by Occultation of Stars) instrument on board the Envisat satellite. In GOMOS retrievals, the

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3

Melrose, D. B. "Twinkle, Twinkle Little Pulsar/Quasar." Australian Journal of Physics 52, no. 1 (1999): 1. http://dx.doi.org/10.1071/p98076.

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The twinkling of stars is a familiar example of scintillations, due to turbulence in the Earth’s atmosphere causing fluctuations in the refractive index of the air along the line of sight. Scintillations lead to time variations in the apparent position of the source, and hence to an angular broadening on integration over an observation time. Scintillations also lead to fluctuations in the intensity of the source. Pointlike astronomical radio sources such as pulsars and (the compact cores of some) quasars scintillate due to fluctuations in the electron density along the line of sight through th

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4

O’Brien, Sean M., Daniel Bayliss, James Osborn, Edward M. Bryant, James McCormac, Peter J. Wheatley, Jack S. Acton, et al. "Scintillation-limited photometry with the 20-cm NGTS telescopes at Paranal Observatory." Monthly Notices of the Royal Astronomical Society 509, no. 4 (November 26, 2021): 6111–18. http://dx.doi.org/10.1093/mnras/stab3399.

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ABSTRACT Ground-based photometry of bright stars is expected to be limited by atmospheric scintillation, although in practice observations are often limited by other sources of systematic noise. We analyse 122 nights of bright star (Gmag ≲ 11.5) photometry using the 20-cm telescopes of the Next-Generation Transit Survey (NGTS) at the Paranal Observatory in Chile. We compare the noise properties to theoretical noise models and we demonstrate that NGTS photometry of bright stars is indeed limited by atmospheric scintillation. We determine a median scintillation coefficient at the Paranal Observa

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5

Kan, V., V. F. Sofieva, and F. Dalaudier. "Variable anisotropy of small-scale stratospheric irregularities retrieved from stellar scintillation measurements by GOMOS/Envisat." Atmospheric Measurement Techniques 7, no. 6 (June 25, 2014): 1861–72. http://dx.doi.org/10.5194/amt-7-1861-2014.

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Abstract. In this paper, we consider possibilities for studying the anisotropy of small-scale air density irregularities using satellite observations of bi-chromatic stellar scintillations during tangential occultations. Estimation of the anisotropy coefficient (the ratio of the characteristic horizontal to vertical scales) and other atmospheric parameters is based on the comparison of simulated/theoretical and experimental auto-spectra and coherency spectra of scintillation. Our analyses exploit a 3-D model of the spectrum of atmospheric inhomogeneities, which consists of anisotropic and isot

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6

Kan, V., V. F. Sofieva, and F. Dalaudier. "Variable anisotropy of small-scale stratospheric irregularities retrieved from stellar scintillation measurements by GOMOS/Envisat." Atmospheric Measurement Techniques Discussions 7, no. 2 (February 10, 2014): 1275–304. http://dx.doi.org/10.5194/amtd-7-1275-2014.

Testo completo

Abstract (sommario):

Abstract. In this paper, we consider possibilities for studying the anisotropy of small-scale air density irregularities using satellite observations of bi-chromatic stellar scintillations during tangential occultations. Estimation of the anisotropy coefficient (the ratio of the characteristic horizontal to vertical scales) and other atmospheric parameters is based on the comparison of simulated/theoretical and experimental auto-spectra and coherency spectra of scintillation. Our analyses exploit a 3-D model of the spectrum of atmospheric inhomogeneities, which consists of anisotropic and isot

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7

Hamacher, Duane W., John Barsa, Segar Passi, and Alo Tapim. "Indigenous use of stellar scintillation to predict weather and seasonal change." Proceedings of the Royal Society of Victoria 131, no. 1 (2019): 24. http://dx.doi.org/10.1071/rs19003.

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Indigenous peoples across the world observe the motions and positions of stars to develop seasonal calendars. Changing properties of stars, such as their brightness and colour, are also used for predicting weather. Combining archival studies with ethnographic fieldwork in Australia’s Torres Strait, we explore the various ways Indigenous peoples utilise stellar scintillation (twinkling) as an indicator for predicting weather and seasonal change, and examine the Indigenous and Western scientific underpinnings of this knowledge. By observing subtle changes in the ways the stars twinkle, Meriam pe

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8

Dravins, D., L. Lindegren, and E. Mezey. "Atmospheric Intensity Scintillation of Stars on Milli- and Microsecond Time Scales." International Astronomical Union Colloquium 136 (1993): 113–19. http://dx.doi.org/10.1017/s0252921100007454.

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AbstractStellar intensity scintillation on short and very short time scales (≃ 100 ms - 100 ns) was studied using an optical telescope on La Palma (Canary Islands). Photon counting detectors and real-time signal processing equipment were used to study atmospheric scintillation as function of telescope aperture size, degree of apodization, for single and double apertures, in different optical colors, at different zenith distances, times of night, and seasons of year. The statistics of temporal intensity variations can be adequately described by log-normal distributions, varying with time. The s

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9

Kan, V., V. F. Sofieva та F. Dalaudier. "Anisotropy of small-scale stratospheric irregularities retrieved from scintillations of a double star α-Cru observed by GOMOS/ENVISAT". Atmospheric Measurement Techniques Discussions 5, № 4 (13 липня 2012): 4881–904. http://dx.doi.org/10.5194/amtd-5-4881-2012.

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Abstract (sommario):

Abstract. In this paper, we discuss estimating anisotropy of air density irregularities (ratio of characteristic horizontal and vertical scales) from satellite observations of bi-chromatic scintillations of a double star whose components are not resolved by the detector. The analysis is based on fitting experimental auto- and cross-spectra of scintillations by those computed using the 3-D spectral model of atmospheric irregularities consisting of anisotropic and isotropic components. Application of the developed method to the scintillation measurements of the double star α-Cru by GOMOS (Global

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10

Kan, V., V. F. Sofieva та F. Dalaudier. "Anisotropy of small-scale stratospheric irregularities retrieved from scintillations of a double star α-Cru observed by GOMOS/ENVISAT". Atmospheric Measurement Techniques 5, № 11 (14 листопада 2012): 2713–22. http://dx.doi.org/10.5194/amt-5-2713-2012.

Testo completo

Abstract (sommario):

Abstract. In this paper, we discuss estimating anisotropy of air density irregularities (ratio of characteristic horizontal and vertical scales) from satellite observations of bi-chromatic scintillations of a double star whose components are not resolved by the detector. The analysis is based on fitting experimental auto- and cross-spectra of scintillations by those computed using the 3-D spectral model of atmospheric irregularities consisting of anisotropic and isotropic components. Application of the developed method to the scintillation measurements of the double star α-Cru by GOMOS (Global

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Più fonti

Tesi sul tema "Stars Scintillation"

1

Campbell, Laurence. "Stellar scintillation and its use in atmospheric measurements /." Title page, contents and summary only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phc1885.pdf.

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2

Bignall, Hayley Emma. "Radio variability and interstellar scintillation of blazars." [Adelaide : H.E. Bignall, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09phb5931.pdf.

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Abstract (sommario):

Bibliography: leaves 191-202. 1. Introduction -- 2. Instrumentation and calibration -- 3. A radio monitoring program for southern blazars -- 4. Analysis of long-term blazar radio variability -- 5. Probing microarcsecond-scale structure using interstellar scintillation -- 6. The rapid scintillator, PKS 1257-326 -- 7. Conclusions and scope for further work.

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3

Pooser, Eric J. "The GlueX Start Counter & Beam Asymmetry $\Sigma$ in Single $\pi^{0}$ Photoproduction." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2450.

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The GlueX experiment aims to study meson photoproduction while utilizing the coherent bremsstrahlung technique to produce a 9 GeV linearly polarized photon beam incident on a liquid $\mathrm{H_{2}}$ target. A Start Counter detector was fabricated to properly identify the accelerator electron beam buckets and to provide accurate timing information. The Start Counter detector was designed to operate at photon intensities of up to $\mathrm{10^{8}\gamma/s}$ in the coherent peak and provides a timing resolution $\mathrm{\sim 300\ ps}$ so as to provide successful identification of the electron beam

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4

Taylor, Simon John. "Scintillation detector development for the solenoidal tracker at RHIC (STAR) and the CEBAF large acceptance spectrometer (CLAS)." Thesis, 1996. http://hdl.handle.net/1911/14102.

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After a brief introduction describing some of the physics and mechanics of scintillation detection, results of the development for the Central Trigger Barrel (CTB) for STAR and the Start Counter for CLAS are discussed. For the CTB development, 1 cm x 20 cm x 100 cm scintillators were studied with light guides of various geometries and materials attached to one end in order to optimize the uniformity and overall gain. The best results were obtained using a 61$\sp\circ$ OP-1 light guide attached to a BC 408 scintillator. An alternate approach using a wavelength shifter produces much lower pulse

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Capitoli di libri sul tema "Stars Scintillation"

1

Cordes, J. M. "Interstellar Scintillations and Neutron Star Kinematics." In The Origin and Evolution of Neutron Stars, 35–46. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3913-4_4.

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2

Stanimirović, S., J. M. Weisberg, A. Hedden, K. Devine, T. Green, and S. B. Anderson. "The Tiny-Scale Atomic Structure: Gas Cloudlets or Scintillation Phenomenon ?" In Magnetic Fields and Star Formation, 103–9. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-94-017-0491-5_10.

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3

Kolanoski, Hermann, and Norbert Wermes. "Photodetectors." In Particle Detectors, 405–36. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198858362.003.0010.

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Abstract (sommario):

The chapter covers photodetectors for photons in the optical and near UV range (about 200 nm to 700 nm). Important for particle and astroparticle experiments are photodetectors which detect light generated in scintillation or Cherenkov detectors, for example. The detection of photons always starts with the generation of an electron by photoeffect at a photocathode. The photoelectron can then be either multiplied in a photomultiplier tube by secondary electron emission or the cathode could be the surface of a semiconductor detector; both techniques can also be combined in hybrid photodetectors. A relatively new semiconductor detector is the silicon photomultiplier using an avalanche operation mode to obtain sufficiently large signals. In the last section the different photodetectors are compared and are assigned to typical applications according to their properties.

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Atti di convegni sul tema "Stars Scintillation"

1

Novoseltsev, Yu F., M. M. Boliev, I. M. Dzaparova, S. P. Mikheyev, R. V. Novoseltseva, V. B. Petkov, P. S. Striganov, G. V. Volchenko, V. I. Volchenko, and A. F. Yanin. "Search for neutrino bursts from gravitational collapse of stars at the Baksan Underground Scintillation Telescope." In Proceedings of the 11th Conference. WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814307529_0050.

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2

Camera, Franco, and Agnese Giaz. "New scintillator materials for future and present facilities." In EXOTIC NUCLEI AND NUCLEAR/PARTICLE ASTROPHYSICS (V). FROM NUCLEI TO STARS: Carpathian Summer School of Physics 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4909582.

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3

De La Rue, Imelda A., Patrick T. Ryan, Dustin C. Johnston, and Robert Q. Fugate. "Scintillation data comparison between a star and laser returns from a high-altitude balloon payload." In Optical Science, Engineering and Instrumentation '97, edited by Luc R. Bissonnette and Christopher Dainty. SPIE, 1997. http://dx.doi.org/10.1117/12.283895.

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