![]() Sensing heat at long wavelengths, the JIRAM instrument detects hotspots in the daylight and at night. 21 gave us a unique opportunity to observe Io’s volcanic activity with the SRU using only Europa’s moonlight as our lightbulb,” said Heidi Becker, lead of Juno’s Radiation Monitoring Investigation, at NASA’s Jet Propulsion Laboratory. “As a low-light camera designed to track the stars, the SRU can only observe Io under very dimly lit conditions. The brightest feature on Io in the image is thought to be a penetrating radiation signature, a reminder of this satellite’s role in feeding Jupiter’s radiation belts, while other features show the glow of activity from several volcanoes. ![]() SRU images released by SwRI depict Io softly illuminated by moonlight from Europa. “The ground is already in shadow, but the height of the plume allows it to reflect sunlight, much like the way mountaintops or clouds on the Earth continue to be lit after the sun has set,” explained Candice Hansen-Koharcheck, the JunoCam lead from the Planetary Science Institute.Īt 12:40 UTC, after Io had passed into the darkness of total eclipse behind Jupiter, sunlight reflecting off nearby moon Europa helped to illuminate Io and its plume. The Images show the moon half-illuminated with a bright spot seen just beyond the terminator, the day-night boundary. 21 at 12:00, 12:15 and 12:20 coordinated universal time (UTC) before Io entered Jupiter’s shadow. JunoCam acquired the first images on Dec. “This is quite a New Year’s present showing us that Juno has the ability to clearly see plumes.” “We knew we were breaking new ground with a multi-spectral campaign to view Io’s polar region, but no one expected we would get so lucky as to see an active volcanic plume shooting material off the moon’s surface,” said Scott Bolton, principal investigator of the Juno mission and an associate vice president of Southwest Research Institute’s Space Science and Engineering Division. JunoCam, the Stellar Reference Unit (SRU), the Jovian Infrared Auroral Mapper (JIRAM) and the Ultraviolet Imaging Spectrograph (UVS) observed Io for over an hour, providing a glimpse of the moon’s polar regions as well as evidence of an active eruption. 21, during winter solstice, four of Juno’s cameras captured images of the Jovian moon Io, the most volcanic body in our solar system. 31, 2018 - A team of space scientists has captured new images of a volcanic plume on Jupiter’s moon Io during the Juno mission’s 17th flyby of the gas giant. Light from the plumes and fires of Io on Earth’s darkest nightĭec. ![]()
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