Detail View: NASA Planetary Photo Journal Collection: Io - One of at Least Four Simultaneous Erupting Volcanic Eruptions

Title: 
Io - One of at Least Four Simultaneous Erupting Volcanic Eruptions
Original Caption Released with Image: 
This photo of an active volcanic eruption on Jupiter's satellite Io was taken 1 hour, 52 minutes after the accompanying picture, late in the evening of March 4, 1979, Pacific time. On the limb of the satellite can be seen one of at least four simultaneous volcanic eruptions -- the first such activity ever observed on another celestial body. Seen against the limb are plume-like structures rising more than 60 miles (100 kilometers) above the surface. Several eruptions have been identified with volcanic structures on the surface of Io, which have also been identified by Voyager 1's infrared instrument as being abnormally hot -- several hundred degrees warmer than surrounding terrain. The fact that several eruptions appear to be occurring at the same time suggests that Io has the most active surface in the solar system and that volcanism is going on there essentially continuously. Another characteristic of the observed volcanism is that it appears to be extremely explosive, with velocities more than 2,000 miles an hour (at least 1 kilometer per second). That is more violent than terrestrial volcanoes like Etna, Vesuvius or Krakatoa.
Addition Date: 
1996-11-16
Produced By: 
JPL
Mission: 
Voyager
Spacecraft: 
Voyager 1
Target Name: 
Io
Is a satellite of: 
Jupiter
Instrument: 
Imaging Science Subsystem - Narrow Angle
Product Size: 
220 samples x 300 lines
Primary Data Set: 
Voyager EDRs
Producer ID: 
P21295
facet_what: 
Imaging Science Subsystem (ISS)
facet_where: 
Jet Propulsion Laboratory (JPL)
facet_when: 
March 4, 1979
facet_when_year: 
1979
Image #: 
PIA00374
UID: 
SPD-PHOTJ-PIA00374
original url: 
http://photojournal.jpl.nasa.gov/catalog/PIA00374