title: Io volcanism seen by new horizons: a major eruption of the Tvashtar volcano.
abstract: Jupiter's moon Io is known to host active volcanoes. In February and March 2007, the New Horizons spacecraft obtained a global snapshot of Io's volcanism. A 350-kilometer-high volcanic plume was seen to emanate from the Tvashtar volcano (62 degrees N, 122 degrees W), and its motion was observed. The plume's morphology and dynamics support nonballistic models of large Io plumes and also suggest that most visible plume particles condensed within the plume rather than being ejected from the source. In images taken in Jupiter eclipse, nonthermal visible-wavelength emission was seen from individual volcanoes near Io's sub-Jupiter and anti-Jupiter points. Near-infrared emission from the brightest volcanoes indicates minimum magma temperatures in the 1150- to 1335-kelvin range, consistent with basaltic composition.
authors.affiliation: Southwest Research Institute, 1050 Walnut Street, Suite 300, Boulder, CO 80302, USA. spencer@boulder.swri.edu
authors.forename: J R
authors.initials: JR
authors.lastname: Spencer
authors.forename: S A
authors.initials: SA
authors.lastname: Stern
authors.forename: A F
authors.initials: AF
authors.lastname: Cheng
authors.forename: H A
authors.initials: HA
authors.lastname: Weaver
authors.forename: D C
authors.initials: DC
authors.lastname: Reuter
authors.forename: K
authors.initials: K
authors.lastname: Retherford
authors.forename: A
authors.initials: A
authors.lastname: Lunsford
authors.forename: J M
authors.initials: JM
authors.lastname: Moore
authors.forename: O
authors.initials: O
authors.lastname: Abramov
authors.forename: R M C
authors.initials: RM
authors.lastname: Lopes
authors.forename: J E
authors.initials: JE
authors.lastname: Perry
authors.forename: L
authors.initials: L
authors.lastname: Kamp
authors.forename: M
authors.initials: M
authors.lastname: Showalter
authors.forename: K L
authors.initials: KL
authors.lastname: Jessup
authors.forename: F
authors.initials: F
authors.lastname: Marchis
authors.forename: P M
authors.initials: PM
authors.lastname: Schenk
authors.forename: C
authors.initials: C
authors.lastname: Dumas