PIA00379: Volcanic Eruptions on Io

Volcanic Eruptions on Io


This dramatic view of Jupiter's satellite Io shows two simultaneously occurring volcanic eruptions. One can be seen on the limb, (at lower right) in which ash clouds are rising more than 150 miles (260 kilometers) above the satellite's surface. The second can be seen on the terminator (shadow between day and night) where the volcanic cloud is catching the rays of the rising sun. The dark hemisphere of Io is made visible by light reflected from Jupiter. Seen in Io's night sky, Jupiter looms almost 40 times larger and 200 times brighter than our own full Moon. This photo was taken by Voyager 1 on March 8, 1979, looking back 2.6 million miles (4.5 million kilometers) at Io, three days after its historic encounter. This is the same image in which Linda A. Morabito, a JPL engineer, discovered the first extraterrestrial volcanic eruption (the bright curved volcanic cloud on the limb).

Background Info:

Jet Propulsion Laboratory manages and controls the Voyager project for NASA's Office of Space Science.

Cataloging Keywords:

Name Value Additional Values
Target Io Earth, Jupiter, Moon, Sun
System Jupiter Earth
Target Type Satellite Earth, Planet, Sun
Mission Voyager
Instrument Host Voyager 1
Host Type Flyby Spacecraft
Instrument Imaging Science Subsystem (ISS)
Extra Keywords Grayscale, Shadow, Volcano
Acquisition Date
Release Date 1997-01-09
Date in Caption 1979-03-08
Image Credit NASA/JPL
Source photojournal.jpl.nasa.gov/catalog/PIA00379
Identifier PIA00379