Reference : Characteristics of Saturn's polar atmosphere and auroral electrons derived from HST/S...
Scientific congresses and symposiums : Poster
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/128417
Characteristics of Saturn's polar atmosphere and auroral electrons derived from HST/STIS, FUSE and Cassini/UVIS spectra
English
Gustin, Jacques mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Physique des atmosphères et des environnements planétaires >]
Pryor, W. [Central Arizona College, 8470 N. Overfield Road, Coolidge, AZ 85228, USA]
Feldman, P. [Department of Physics and Astronomy - JHU, 3400 N. Charles Street, Baltimore, MD 21218, USA]
Gérard, Jean-Claude mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Grodent, Denis mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Physique des atmosphères et des environnements planétaires >]
Holsclaw, G. [Laboratory for Atmospheric and Space Physics - CU, 1234 Innovation Drive, Boulder, CO 80303, USA )]
1-Dec-2008
No
American Geophysical Union, Fall Meeting 2008
december 2008
[en] 0310 Airglow and aurora ; 6275 Saturn ; 7845 Particle acceleration
[en] Ultraviolet spectra of Saturn's aurora obtained with the Hubble Space Telescope Imaging Spectrograph (STIS), the Cassini Ultraviolet Imaging Spectrograph (UVIS) and the Far Ultraviolet Spectroscopic Explorer (FUSE) have been compared to synthetic spectra of electron-excited H2 in order to derive various auroral characteristics, such as the energy of the primary precipitating electrons and the H2 temperature at the altitude of the aurora. Two physical processes have been exploited: the absorption by hydrocarbons in the FUV and H2 self-absorption in the EUV. We find energies in the range 10-18 keV, which locates Saturns's aurora between 0.1 and 0.3 μ bar. We also determined that the auroral H2 emission is characterized by a temperature of ~400K, consistent with temperatures measured in the infrared, but much higher than what is expected from equatorial atmospheric models. These new results bring valuable constraints on both polar atmospheric models and theoretical studies of the ionosphere-magnetosphere coupling.
http://hdl.handle.net/2268/128417
http://adsabs.harvard.edu/abs/2008AGUFMSM41B1659G

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