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29 March 2024 |
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Measurements of the Near-Nucleus Coma of Comet 67P/Churyumov-Gerasimenko with the Alice Far-Ultraviolet Spectrograph on Rosetta | Paul D. Feldman
; Michael F. A'Hearn
; Jean-Loup Bertaux
; Lori M. Feaga
; Joel Wm. Parker
; Eric Schindhelm
; Andrew J. Steffl
; S. Alan Stern
; Harold A. Weaver
; Holger Sierks
; Jean-Baptiste Vincent
; | Date: |
3 Jun 2015 | Abstract: | Aims. The Alice far-ultraviolet spectrograph onboard Rosetta is designed to
observe emissions from various atomic and molecular species from within the
coma of comet 67P/ Churyumov-Gerasimenko and to determine their spatial
distribution and evolution with time and heliocentric distance. Methods.
Following orbit insertion in August 2014, Alice made observations of the inner
coma above the limbs of the nucleus of the comet from cometocentric distances
varying between 10 and 80 km. Depending on the position and orientation of the
slit relative to the nucleus, emissions of atomic hydrogen and oxygen were
initially detected. These emissions are spatially localized close to the
nucleus and spatially variable with a strong enhancement above the comet’s neck
at northern latitudes. Weaker emission from atomic carbon and CO were
subsequently detected. Results. Analysis of the relative line intensities
suggests photoelectron impact dissociation of H2O vapor as the source of the
observed H I and O I emissions. The electrons are produced by photoionization
of H2O. The observed C I emissions are also attributed to electron impact
dissociation, of CO2, and their relative brightness to H I reflects the
variation of CO2 to H2O column abundance in the coma. | Source: | arXiv, 1506.1203 | Services: | Forum | Review | PDF | Favorites |
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