Results 151 to 160 of about 2,512 (186)

Coma dust scattering concepts applied to the Rosetta mission

Icarus, 2015
Abstract This paper describes basic concepts, as well as providing a framework, for the interpretation of the light scattered by the dust in a cometary coma as observed by instruments on a spacecraft such as Rosetta. It is shown that the expected optical depths are small enough that single scattering can be applied.
Uwe Fink, Giovanna Rinaldi
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Infrared emission from P/Halley’s dust coma during March 1986

1988
2 to 20 micrometers photometry of the inner dust coma of comet Halley was obtained at the NASA IRTF on Mar 6.85, 12.8, 13.75, 17.7, and 24.8. Positions offset 10" were measured as well as the central brightness. The strength of the 10 micrometers emission feature was observed to vary with location in the coma.
M S, Hanner, A T, Tokunaga, W F, Golisch, D M, Griep, C D, Kaminski   +4 more
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Dust Measurements in the Coma of Comet 81P/Wild 2 by the Dust Flux Monitor Instrument

Science, 2004
We present measurements of the dust particle flux and mass distribution from the Stardust Dust Flux Monitor Instrument (DFMI) throughout the flyby of comet 81P/Wild 2. In the particle mass regime from 10 –14 to 10 –7 kilograms, the spacecraft encountered regions of intense swarms of particles,
Anthony J, Tuzzolino, Thanasis E, Economou, Ben C, Clark, Peter, Tsou, Donald E, Brownlee, Simon F, Green, J A M, McDonnell, Neil, McBride, Melusine T S H, Colwell   +8 more
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Confirmation of dust clusters in the coma of Comet Halley

Advances in Space Research, 1989
Measurements from the Ducma dust counter and mass analyzer on the Vega spacecraft are compared with those from the SP-1 sensor on the same spacecraft. It is shown that the sequence of pulses recorded by the SP-1 instruments show deviations from a random distribution. Some of the nonrandom sequences observed by SP-1 are in the same time intervals as the
J.A. Simpson, A.J. Tuzzolino, L.V. Ksanfomality, R.Z. Sagdeev, O.L. Vaisberg   +4 more
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The dust coma of periodic comet Churyumov-Gerasimenko (1982 VIII)

Icarus, 1985
IR emission from the dust comet of Comet C-G was monitored at 1-20 microns with the 3-m NASA Infrared Telescope Facility at Mauna Kea, Hawaii during its perihelion passage from September 1982 to March 1983. The maximum dust production rate of approximately 200,000 g/sec was found to occur approximately one month after perihelion. It was also found that
M.S. Hanner, E. Tedesco, A.T. Tokunaga, G.J. Veeder, D.F. Lester, F.C. Witteborn, J.D. Bregman, J. Gradie, L. Lebofsky   +8 more
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Dust in Comet 103P/Hartley 2 coma during EPOXI mission

Icarus, 2013
Abstract The Deep Impact spacecraft flew by Comet 103P/Hartley 2 on 4 November 2010 (EPOXI mission). In situ observations are complemented by a systematic ground- and space-based observation campaign. In the present work, imaging polarimetry is used to emphasize different dust regions in the coma and follow their evolution over a period including the
Hadamcik, Edith, Sen, A. K., Levasseur-Regourd, Anny Chantal, Gupta, Rajiv, Lasue, Jérémie, Botet, R.   +5 more
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Gas kinetics and dust dynamics in low-density comet comae

Icarus, 2010
Abstract Extensive regions of low-density cometary comae are characterized by important deviations from the Maxwell–Boltzmann velocity distribution, i.e. breakdown of thermodynamic equilibrium. The consequences of this on the shapes of emission and absorption lines, and for the acceleration of solid bodies due to gas drag, have rarely been ...
Björn J.R. Davidsson, Samuel Gulkis, Claudia Alexander, Paul von Allmen, Lucas Kamp, Seungwon Lee, Johan Warell   +6 more
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Coma morphology and dust emission pattern of comet Halley

Advances in Space Research, 1985
Abstract This contribution starts with a short overview on cometary dust modelling and then focuses on the application of coma modelling with respect to in-situ measurements of cometary dust and ground based observations. The fountain model, valid for the dynamics of small cometary dust particles, is discussed.
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Dust in the Inner Coma of Comet 67P/Churyumov-Gerasimenko

2021
The main goal of the work presented in this PhD thesis is to investigate the dust dynamics in the near-nucleus coma of comet 67P/Churyumov-Gerasimenko (67P) and to gain a deeper understanding of the physical processes governing it. In our analyses, we study numerical simulation results of gas and dust comae in combination with image analysis of Rosetta
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Dust Spatial Distribution and Radial Profile in Halley's Inner Coma☆

Icarus, 1997
Abstract Mosaic images of the brightness distribution of solar radiation scattered by dust in Halley's coma are constructed using the spectra obtained by the three-channel spectrometer TKS during the approach phase of the Vega 2 spacecraft. They cover a sector having a radius of 40,000 km centered at the nucleus with an angular extent of 50°.
B GOIDETDEVEL, J CLAIREMIDI, P ROUSSELOT, G MOREELS   +3 more
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