Results 21 to 30 of about 282,415 (218)

Dust and gas emission from cometary nuclei: the case of comet 67P/Churyumov–Gerasimenko

Advances in Physics: X, 2018
Comets display with decreasing solar distance an increased emission of gas and dust particles, leading to the formation of the coma and tail. Spacecraft missions provide insight into the temporal and spatial variations of the dust and gas sources located
Tobias Kramer, Matthias Noack, Daniel Baum, Hans-Christian Hege, Eric J. Heller   +4 more
doaj   +1 more source

Parameters of dust jets in comet Encke’s coma

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACTUsing 4412 positional observations, we compute eight single apparition orbits in the period 1993–2017. The analysis of the residuals of the orbit’s fit shows their systematic deviations around perihelia. We assume that these deviations in positional observations are a result of the dust emissions from a restricted area of the nucleus, and that ...
Yu Medvedev, Yu Chernetenko
openaire   +1 more source

Models of Rosetta/OSIRIS 67P Dust Coma Phase Function [PDF]

The Astronomical Journal, 2018
Abstract The phase function of the dust coma of comet 67P has been determined from Rosetta/OSIRIS images. This function shows a deep minimum at phase angles near 100°, and a strong backscattering enhancement. These two properties cannot be reproduced by regular models of cometary dust, most of them based on wavelength-sized and randomly ...
F. Moreno, D. Guirado, O. Muñoz, I. Bertini, C. Tubiana, C. Güttler, M. Fulle, A. Rotundi, V. Della Corte, S. L. Ivanovski, G. Rinaldi, D. Bockelée-Morvan, V. V. Zakharov, J. Agarwal, S. Mottola, I. Toth, E. Frattin, L. M. Lara, P. J. Gutiérrez, Z. Y. Lin, L. Kolokolova, H. Sierks, G. Naletto, P. L. Lamy, R. Rodrigo, D. Koschny, B. Davidsson, M. A. Barucci, J.-L. Bertaux, D. Bodewits, G. Cremonese, V. Da Deppo, S. Debei, M. De Cecco, J. Deller, S. Fornasier, W.-H. Ip, H. U. Keller, M. Lazzarin, J. J. López-Moreno, F. Marzari, X. Shi   +41 more
openaire   +11 more sources

Modelling soil dust aerosol in the Bodélé depression during the BoDEx campaign [PDF]

, 2006
We present regional model simulations of the dust emission events during the Bodélé Dust Experiment (BoDEx) that was carried out in February and March 2005 in Chad. A box model version of the dust emission model is used to test different input parameters
Todd, M., J Helmert (16052072), Dubovik, O., Dubovik, O, J. Helmert, B. Heinold, Tegen, I, R. Washington, Helmert, J, Washington, R, Tegen, I., I Tegen (16051628), Heinold, B, M. Todd, Todd, MC, Heinold, B., Martin Todd (4462747), B Heinold (16051742), I. Tegen, O. Dubovik, Washington, R., O Dubovik (8761467), Helmert, J., R Washington (16051622)   +23 more
core   +2 more sources

Saharan dust and ice nuclei over Central Europe [PDF]

, 2010
Surface measurements of aerosol and ice nuclei (IN) at a Central European mountain site during an episode of dust transport from the Sahara are presented.
B. Nillius, Levin, Zev, Barrie, Leonard A., Nillius, Björn, M. Ebert, Bingemer, Heinz, S. Weinbruch, Ebert, Martin, Nickovic, Slobodan, Haunold, Werner, H. Klein, U. Bundke, Klein, Holger, Bundke, Ulrich, Weinbruch, Stephan, H. Bingemer, L. Schuetz, Z. Levin, Schuetz, Lothar, L. A. Barrie, S. Nickovic, W. Haunold   +21 more
core   +2 more sources

Physical properties of cometary dust from Monte Carlo analysis of tail and coma images

Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali, 2011
Forward and inverse Monte Carlo modeling of cometary dust tail and coma images has provided one of the best approaches to infer the basic physical dust parameters and their time dependence: mass loss rates, ejection velocities, and size distribution ...
F. Moreno
doaj   +1 more source

A numerical model of cometary dust coma structures [PDF]

Astronomy and Astrophysics, 2010
Aims. The purpose of this study is to test our numerical model of cometary dust coma structures and to use the results to infer information about the nucleus surface activity of comet 9P/Tempel 1. Methods. Parameters on the activity were first estimated from simulations of ground-based observation acquired during the preperihelion period (January to ...
Vincent, J., Böhnhardt, H., Lara, L.
openaire   +2 more sources

Monte Carlo Models of Comet Dust Tails Observed from the Ground

Universe, 2022
Dust particles leaving the comet nucleus surface are entrained by the gas within the first few nuclear radius distances and are subjected to a complex hydrodynamical environment.
Fernando Moreno
doaj   +1 more source

The dust coma of Comet P/Giacobini-Zinner in the infrared

The Astronomical Journal, 1992
We present 1-20 micrometers photometry of P/Giacobini-Zinner obtained at the NASA Infrared Telescope Facility, during 1985 June-September (r = 1.57-1.03 AU). A broad, weak 10 micrometers silicate emission feature was detected on August 26.6; a similar weak emission feature could have been hidden in the broadband photometry on other dates.
M S, Hanner, G J, Veeder, A T, Tokunaga
openaire   +2 more sources

Dust emission in powder handling: Free falling particle plume characterisation [PDF]

, 2009
Dust generation during solids handling, principally from the free falling of bulk materials and their impact on stockpiles, can be a health threat for operators and a cause of dust explosions.
Ansart, Renaud, De Ryck, Alain, Dodds, John A.   +2 more
core   +1 more source