|Reference : Morphology and time variation of the Jovian Far UV aurora: Hubble Space Telescope observ...|
|Scientific journals : Article|
|Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics|
|Morphology and time variation of the Jovian Far UV aurora: Hubble Space Telescope observations|
|Gérard, Jean-Claude [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]|
|Dols, Vincent [Universite de Liege, Belgium]|
|Paresce, Francesco [Space Telescope Science Institute, Baltimore, MD, US]|
|Prange, Renee [Space Telescope Science Institute, Baltimore, MD, US]|
|Journal of Geophysical Research|
|American Geophysical Union (AGU)|
|[en] AURORAS ; FAR ULTRAVIOLET RADIATION ; JUPITER ATMOSPHERE ; MORPHOLOGY ; PARTICLE PRECIPITATION ; TEMPORAL DISTRIBUTION ; EMISSION SPECTRA ; FAINT OBJECT CAMERA ; H LINES ; HUBBLE SPACE TELESCOPE ; LYMAN ALPHA RADIATION ; SPATIAL RESOLUTION|
|[en] High spatial resolution images of the north polar region of Jupiter have been obtained with the Faint Object Camera (FOC) on board the Hubble Space Telescope (HST). The first set of two images collected 87 min apart in February 1992 shows a bright (approximately or equal to 180 kR) emission superimposed on the background in rotation with the planet. Both Ly alpha images show common regions of enhanced emission but differences are also observed, possibly due to temporal variations. The second group of images obtained on June 23 and 26, 1992 isolates a spectral region near 153 nm dominated by the H2 Lyman bands and continuum. Both pictures exhibit a narrow arc structure fitting the L = 30 magnetotail field line footprint in the morning sector and a broader diffuse aurora in the afternoon. They show no indication of an evening twilight enhancement. Although the central meridian longitudes were similar, significant differences are seen in the two exposures, especially in the region of diffuse emission, and interpreted as signatures of temporal variations. The total power radiated in the H2 bands is approximately or equal to 2 x 10[SUP]12[/SUP] W, in agreement with previous UV spectrometer observations. The high local H2 emission rates (approximately 450 kR) imply a particle precipitation carrying an energy flux of about 5 x 10[SUP]-2[/SUP] W/sq m.|
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