title: Extreme ultraviolet observations from the voyager 2 encounter with saturn.
abstract: Combined analysis of helium (584 angstroms) airglow and the atmospheric occultations of the star delta Scorpii imply a vertical mixing parameter in Saturn's upper atmosphere of K (eddy diffusion coefficient) approximately 8 x 10(7) square centimeters per second, an order of magnitude more vigorous than mixing in Jupiter's upper atmosphere. Atmospheric H(2) band absorption of starlight yields a preliminary temperature of 400 K in the exosphere and a temperature near the homopause of approximately 200 K. The energy source for the mid-latitude H(2) band emission still remains a puzzle. Certain auroral emissions can be fully explained in terms of electron impact on H(2), and auroral morphology suggests a link between the aurora and the Saturn kilometric radiation. Absolute optical depths have been determined for the entire C ring andparts of the A and B rings. A new eccentric ringlet has been detected in the C ring. The extreme ultraviolet reflectance of the rings is fairly uniform at 3.5 to 5 percent. Collisions may control the distribution of H in Titan's H torus, which has a total vertical extent of approximately 14 Saturn radii normal to the orbit plane.
authors.forename: B R
authors.initials: BR
authors.lastname: Sandel
authors.forename: D E
authors.initials: DE
authors.lastname: Shemansky
authors.forename: A L
authors.initials: AL
authors.lastname: Broadfoot
authors.forename: J B
authors.initials: JB
authors.lastname: Holberg
authors.forename: G R
authors.initials: GR
authors.lastname: Smith
authors.forename: J C
authors.initials: JC
authors.lastname: McConnell
authors.forename: D F
authors.initials: DF
authors.lastname: Strobel
authors.forename: S K
authors.initials: SK
authors.lastname: Atreya
authors.forename: T M
authors.initials: TM
authors.lastname: Donahue
authors.forename: H W
authors.initials: HW
authors.lastname: Moos
authors.forename: D M
authors.initials: DM
authors.lastname: Hunten
authors.forename: R B
authors.initials: RB
authors.lastname: Pomphrey
authors.forename: S
authors.initials: S
authors.lastname: Linick