ORBi: Gérard Jean-Claude - HST-FOC observations of a remarkable UV auroral event on Jupiter

Reference : HST-FOC observations of a remarkable UV auroral event on Jupiter


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/93579

Title :	HST-FOC observations of a remarkable UV auroral event on Jupiter
Language :	English
Author, co-author :	Gérard, Jean-Claude [Université de Liège - ULg > AGO > Labo de Physique Atmosphérique et Planétaire > >]
	Grodent, Denis [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
	Prangé, R. [> >]
	Waite, J. H. [> > > >]
	Gladstone, G. R. [> > > >]
	Dols, V. [> > > >]
	Paresce, F. [> > > >]
	Storrs, A. [> > > >]
	Ballester, G. [> > > >]
	Ben-Jaffel, L. [> > > >]
Publication date :	1994
Journal title :	NASA STI/Recon Technical Report N
Volume :	95
Pages :	30806
Peer reviewed :	No
Audience :	International
Keywords :	[en] ATMOSPHERIC HEATING ; AURORAS ; COROTATION ; EXTREME ULTRAVIOLET RADIATION ; FAINT OBJECT CAMERA ; H LINES ; JUPITER (PLANET) ; JUPITER ATMOSPHERE ; SOLAR ELECTRONS ; SPACEBORNE ASTRONOMY ; THERMOSPHERE ; ULTRAVIOLET ASTRONOMY ; ATMOSPHERIC TEMPERATURE ; BRIGHTNESS ; ELECTRON PRECIPITATION ; FLUX DENSITY ; HUBBLE SPACE TELESCOPE ; ULTRAVIOLET SPECTRA ; WINDS ALOFT
Abstract :	[en] Two sets of UV (ultraviolet) images of the Jovian north aurora were obtained with the Faint Object Camera (FOC) on Hubble. The first series shows a very intense discrete arc in corotation with the planet. The maximum apparent H2 emission rate corresponds to an electron precipitation of approximately 1/sq Wm, a very large flux in comparison with the solar EUV (extreme ultraviolet) heating. The hugh particle heating rate of the auroral upper atmosphere of Jupiter is expected to cause a large transient temperature increase and generate strong thermospheric winds. Twenty hours later, the discrete arc had considerably decreased in brightness. The timescale and magnitude of the change in the UV aurora strongly suggests that the discrete Jovian auroral precipitation is related to large scale current system variations as are the Earth's discrete aurorae.
Permalink :	http://hdl.handle.net/2268/93579
	also: http://hdl.handle.net/2268/97448

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