PIA02549: Temperature Comparison at Loki

Temperature Comparison at Loki


This image compares temperatures at the volcano Loki, the most powerful volcano on Io, seen by the photopolarimeter-radiometer instrument onboard NASA's Galileo spacecraft during its October 1999 flyby of Jupiter's moon Io (main image), and during its February 2000 flyby (inset). The hottest regions are within the huge, 200-kilometer (120-mile) wide caldera (the dark, horseshoe-shaped region in the image). Temperature contours are in degrees Kelvin (Kelvin): 160 K is -171 F and 320 K is +116 F. In the 4 1/2 months between the images, the hot region seen in October in the southwest part of the caldera disappeared, and the eastern part of the caldera became about 40 degrees Kelvin (70 degrees Fahrenheit) hotter. The temperature increase probably results from lava flows flooding over 10,000 square kilometers (4,000 square miles) of the caldera floor.

Background Info:

Additional information about the Hubble Space Telescope is available at http://www.stsci.edu/hst/ . Additional information about the Galileo mission is available at http://galileo.jpl.nasa.gov .

Cataloging Keywords:

Name Value Additional Values
Target Io
System Jupiter
Target Type Satellite
Mission Galileo Hubble Space Telescope (HST)
Instrument Host Galileo Orbiter Hubble Space Telescope
Host Type Orbiter Space Telescope
Instrument Near-Infrared Mapping Spectrometer (NIMS)
Extra Keywords Color, Volcano
Acquisition Date
Release Date 2000-05-18
Date in Caption
Image Credit NASA/JPL/Lowell Observatory
Source photojournal.jpl.nasa.gov/catalog/PIA02549
Identifier PIA02549