Article (Scientific journals)
Measurements of the helium 584 Å airglow during the Cassini flyby of Venus
Gérard, Jean-Claude; Gustin, Jacques; Hubert, Benoît et al.
2011In Planetary and Space Science, 59, p. 1524-1528
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Abstract :
[en] The helium resonance line at 584 Å has been observed with the UltraViolet Imaging Spectrograph (UVIS) Extreme Ultraviolet channel during the flyby of Venus by Cassini at a period of high solar activity. The brightness was measured along the disk from the morning terminator up to the bright limb near local noon. The mean disk intensity was ˜320 R, reaching ˜700 R at the bright limb. These values are slightly higher than those determined from previous observations. The sensitivity of the 584 Å intensity to the helium abundance is analyzed using recent cross-sections and solar irradiance measurements at 584 Å. The intensity distribution along the UVIS footprint on the disk is best reproduced using the EUVAC solar flux model and the helium density distribution from the VTS3 empirical model. It corresponds to a helium density of 8×10[SUP]6[/SUP] cm[SUP]-3[/SUP] at the level of where the CO[SUB]2[/SUB] is 2×10[SUP]10[/SUP] cm[SUP]-3[/SUP].
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gérard, Jean-Claude  ;  Laboratoire de Physique Atmosphérique et Planétaire, Université de Liège, 17, allée du 6 août, B5c, B-4000 Liège, Belgium
Gustin, Jacques ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Hubert, Benoît  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gladstone, G. R.;  Southwest Research Institute, P.O. Drawer 28510, 6220 Culebra Road, San Antonio, TX 78238-5166, USA
Esposito, L. W.;  Laboratory for Atmospheric and Space Physics, University of Colorado, Campus Box 392, Boulder, CO 80309-0392, USA
Language :
English
Title :
Measurements of the helium 584 Å airglow during the Cassini flyby of Venus
Publication date :
01 October 2011
Journal title :
Planetary and Space Science
ISSN :
0032-0633
Publisher :
Pergamon Press - An Imprint of Elsevier Science, Oxford, United Kingdom
Volume :
59
Pages :
1524-1528
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 October 2011

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