Results 181 to 190 of about 282,415 (218)
Dust and C_2-Contents in the Coma of HALLEY's Comet(1986III)
Dust and C_2-Contents in the Coma of HALLEY's Comet(1986III)openaire +1 more source
On the similarity of dust flows in the inner coma of comets [PDF]
Icarus, 2021 Abstract The atmosphere of a comet is formed by the sublimation, due to solar illumination, of its volatile component and the dust particles ejected from its nucleus and entrained by the gas flow. Contemporary dusty-gas coma models take into account numerous physical processes occurring in the coma and a complex geometry of the nucleus.
Alessandra Rotundi +2 more
exaly +4 more sources
Dust in the Inner Coma of Comet 67P/Churyumov-Gerasimenko [PDF]
, 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
Gerig, Selina-Barbara
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Gas and dust jets in the inner coma of comet Halley
Nature, 1988Cyanogen (CN) jets were discovered in comet Halley by applying an image processing ring masking technique to ground-based observations1,2. We now report the detection of dust, C2, C3, CN and ([O I] + NH2) jet features in comet Halley during the period of the spacecraft Giotto encounter (13–18 March 1986).
Cristiano B. Cosmovici +3 more
exaly +2 more sources
Coma dust scattering concepts applied to the Rosetta mission
Icarus, 2015Abstract 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.
Giovanna Rinaldi, Uwe Fink
exaly +2 more sources
Dayside-to-nightside dust coma brightness asymmetry and its implications for nightside activity at Comet 67P/Churyumov–Gerasimenko [PDF]
Icarus, 2020 We have determined the dust coma brightness ratio between the dayside and the nightside (DS:NS) in OSIRISimages of comet 67P/Churyumov–Gerasimenko and compared them to results from numerical dust comasimulations to learn more about the dynamic processes ...
Nicolas Thomas +2 more
exaly +4 more sources
The dust grains in the coma of Comet West
Earth, Moon, and Planets, 1987The observed variation of reddening as function of the heliocentric distance and the spatial variation of reddening within the coma of Comet West in the visual wavelength range have been considered to infer the properties of the cometary dust grains.
K. S. Krishna Swamy, G. A. Shah
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Light scattering in cometary dust comae
Earth, Moon, and Planets, 1987Single and multiple scattering calculations were performed for a spherically symmetric cometary atmosphere irradiated by a plane parallel source. It is suggested that the increased flux found for anisotropic phase functions is due to the effect of directional scattering in the forward sun-comet axis. The isotropic multiply scattered flux at the surface
Gary Herman, Heikki Salo
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The Dust Coma of Comet C/1999 S4 (LINEAR)
Earth, Moon, and Planets, 2002Comet C/1999 S4 (LINEAR) showed a very special behaviour between 28 June and 1 July 2000. Optical observations of the dust coma in two distinct continuum bands revealed that it changed morphologically as well as in colour. The two-dimensional coma morphology indicates a splitting of the nucleus which probably occurred shortly before the observations of
Rita Schulz, Joachim A. Stüwe
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2008
Analytical expressions for the dust entrainment in the limits of low and high gas production from cometary nuclei are derived. The resulting volume density is used to evaluate the dust production of Comets Encke and Kohoutek from IR-measurements. It is predicted, that the dust in solar direction was diffuse for Comet Kohoutek during approach to the Sun,
K. W. Michel, T. Nishimura
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Analytical expressions for the dust entrainment in the limits of low and high gas production from cometary nuclei are derived. The resulting volume density is used to evaluate the dust production of Comets Encke and Kohoutek from IR-measurements. It is predicted, that the dust in solar direction was diffuse for Comet Kohoutek during approach to the Sun,
K. W. Michel, T. Nishimura
openaire +1 more source