Article (Scientific journals)
Ultraviolet observations of the hydrogen coma of comet C/2013 A1 (Siding Spring) by MAVEN/IUVS
Crismani, M. M. J.; Schneider, N. M.; Deighan, J. I. et al.
2015In Geophysical Research Letters
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Keywords :
Comet Siding Spring; Mars upper atmosphere; Forecasting; Molecules; Orbits; Reservoirs (water); Detectability; Fluences; Mars atmosphere; Volatile evolution; Water production rate; Upper atmosphere
Abstract :
[en] We used the Imaging Ultraviolet Spectrograph (IUVS) aboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) orbiting spacecraft to construct images of the hydrogen coma of comet C/2013 A1 (Siding Spring) days before its close encounter with Mars. We obtain a water production rate of 1.1 ± 0.5 × 1028 molecules/s and determine the total impacting fluence of atoms and molecules corresponding to the photodissociation of water and its daughter species to be 2.4 ± 1.2 × 104 kg. We use these observations to confirm predictions that the mass of delivered hydrogen is comparable to the existing reservoir above 150 km. Furthermore, we reconcile disparity between observations and predictions about the detectability of the hydrogen perturbation and thermospheric response. © 2015. American Geophysical Union. All Rights Reserved.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Crismani, M. M. J.;  Laboratory for Atmospheric and Space Sciences University of Colorado Boulder Boulder, Colorado USA
Schneider, N. M.;  Laboratory for Atmospheric and Space Sciences University of Colorado Boulder Boulder, Colorado USA
Deighan, J. I.;  Laboratory for Atmospheric and Space Sciences University of Colorado Boulder Boulder, Colorado USA
Stewart, A. I. F.;  Laboratory for Atmospheric and Space Sciences University of Colorado Boulder Boulder, Colorado USA
Combi, M.;  Department of Atmospheric, Oceanic, and Space Sciences University of Michigan Ann Arbor, Michigan USA
Chaffin, M. S.;  Laboratory for Atmospheric and Space Sciences University of Colorado Boulder Boulder, Colorado USA
Fougere, N.;  Department of Atmospheric, Oceanic, and Space Sciences University of Michigan Ann Arbor, Michigan USA
Jain, S. K.;  Laboratory for Atmospheric and Space Sciences University of Colorado Boulder Boulder, Colorado USA
Stiepen, Arnaud ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Yelle, R. V.;  Lunar and Planetary Laboratory University of Arizona Tucson, Arizona USA
Mcclintock, W. E.;  Laboratory for Atmospheric and Space Sciences University of Colorado Boulder Boulder, Colorado USA
Clarke, J. T.;  Center for Space Physics Boston University Boston, Massachusetts USA
Holsclaw, G. M.;  Laboratory for Atmospheric and Space Sciences University of Colorado Boulder Boulder, Colorado USA
Montmessin, F.;  LATMOS/IPSL Guyancourt France
Jakosky, Bruce M.;  Laboratory for Atmospheric and Space Sciences University of Colorado Boulder Boulder, Colorado USA
More authors (5 more) Less
Language :
English
Title :
Ultraviolet observations of the hydrogen coma of comet C/2013 A1 (Siding Spring) by MAVEN/IUVS
Publication date :
2015
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
Blackwell Publishing Ltd
Peer reviewed :
Peer Reviewed verified by ORBi
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