May 12, 2017 Volume 23, Number 19 |
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Astronomers Map Out Lava Waves on Io, Jupiter's Most Tumultuous Moon | |
Enormous lava waves spotted on Jupiter moon Io A Rare Peek at the Waves of Lava on Jupiter's Moon Io Waves of lava seen in Io's largest volcanic crater Multi-phase volcanic resurfacing at Loki Patera on Io Volcanoes in the Solar System Space Volcanoes Io, the third largest of Jupiter's 67 moons, is a tumultuous place: it experiences six or more volcanic eruptions each day. Io is also home to Loki Patera, a lava lake that is approximately the size of Wales. Now, thanks to a fortuitous orbital alignment, astronomers have mapped out the lava flows of this gigantic lake. On Thursday, a team led by University of California, Berkeley graduate scholar Katherine de Kleer published a paper in Nature that outlines this feat. On March 8, 2015, Europa passed in front of Io, eclipsing the moon for a short amount of time. This eclipse allowed astronomers to measure the amount of infrared light coming from Loki Patera. The researchers identified a steady increase in surface temperature, from 270 kelvins (26 degrees Fahrenheit, or minus 3 degrees Celsius) at the western end of Loki Patera to 330 kelvins (134 degrees F, or 56 degrees C) at the southeastern end. These observations suggest that "the lava had overturned in two waves that each swept from west to east at about a kilometer [3,300 feet] per day." Overturn occurs when lava on top of a lava lake cools, thickens, and then sinks into the liquid below. When this happens, a wave of magma rises up and travels across the surface of the lake. This process periodically occurs approximately every 18 months, lasting several months at a time. [MMB] The first three links provide research summaries, photographs, and diagrams from this exciting new study, courtesy of The Guardian's Ian Sample, Popular Mechanic's David Grossman, and Robert Sanders of UC Berkeley News. Readers interested in the original study will want to follow the fourth link, while instructors will want to check out a series of lesson plans relating to Io's volcanos, courtesy of the Yale National Initiative to Strengthen Teaching in Public Schools. Finally, from NASA's Space Place, visitors will find an interactive map of volcanoes across the solar system, including Neptune's cryovolcanoes and Mars's Olympus Mons, the largest volcano in our solar system. |