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Exploring Io’s Volcanic Exercise by way of Hubble and Webb Telescopes

August 30, 2023
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Exploring Io’s Volcanic Exercise by way of Hubble and Webb Telescopes
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The 2 strongest house telescopes ever constructed, NASA’s James Webb Space Telescope (JWST) and Hubble Space Telescope, are about to gather data about essentially the most volcanically physique in your entire photo voltaic system, Jupiter’s first Galilean Moon, Io. This knowledge shall be utilized in mixture with upcoming flybys of Io by NASA’s Juno spacecraft, which is presently surveying the Jupiter system and is slated to conduct these flybys later this yr and early 2024. The aim of analyzing this small, volcanic moon with these two highly effective telescopes and one orbiting spacecraft is for scientists to achieve a greater understanding of how Io’s escaping ambiance interacts with Jupiter’s surrounding magnetic and plasma atmosphere.

“The timing of this venture is important,” said Dr. Kurt Retherford, who’s a researcher on the Southwest Analysis Institute (SwRI) and principal investigator of this elaborate science marketing campaign. “Over the following yr, Juno will buzz previous Io a number of instances, providing uncommon alternatives to mix in situ and distant observations of this complicated system. We hope to achieve new insights into Io’s dramatic volcanism, plasma-moon interactions and the impartial fuel and plasma populations that propagate via Jupiter’s huge magnetosphere and set off intense Jovian auroral emissions.”

Requesting observing time on Hubble is finished via NASA’s Hubble Space Telescope Observing Program and is allotted based mostly on the variety of orbits that Hubble shall be requested to finish across the Earth for a science marketing campaign to finish its analysis, with every orbit taking roughly 90 minutes. Sometimes, massive observing initiatives request 75 or extra orbits. This is not going to be the primary time Hubble has examined Jupiter, because it has an extensive history of learning the most important planet within the photo voltaic system.

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For this marketing campaign, Dr. Retherford and his staff shall be utilizing 122 orbits of Hubble across the Earth to assemble knowledge on Io for a complete time of 183 observing hours, or simply over 4.25 full orbits of Io round Jupiter, with every orbit taking roughly 42.5 hours. Moreover, JWST will collect knowledge on Io over the course of 4.8 hours, or simply over 10 % of 1 full orbit of Io round Jupiter.

Jupiter’s large magnetic area is comprised of a large bubble of charged particles that encircles and swirls across the largest planet within the photo voltaic system, of which is comprised primarily of Io’s escaping ambiance. What has remained a thriller to scientists is the interplay between Io’s ambiance, floor volatiles, volcanic eruptions, Io’s prolonged impartial clouds, Jupiter’s ionosphere, and the Io Plasma Torus (IPT), and particularly tips on how to measure and acquire larger insights into it. The IPT is a donut-shaped cloud that encircles Jupiter and is produced from Io’s escaping gases being ionized.  

Idea picture of the varied options inside Jupiter’s surrounding atmosphere that this new science marketing campaign will study, together with its large magnetic area, together with Io’s impartial clouds and plasma torus. (Credit score: Southwest Analysis Institute/John Spencer)

“Most of those supplies don’t really escape straight out of the volcanoes however moderately are related to the sublimation of sulfur dioxide frost from Io’s dayside floor,” stated Dr. Katherine de Kleer, who’s an assistant professor of planetary science and astronomy at Caltech, an knowledgeable in JWST knowledge evaluation, and one among a number of co-investigators on this marketing campaign. “The interplay between Io’s ambiance and the encircling plasma offers the escape mechanism for gases launched from the moon’s frozen floor.”  

After arriving at Jupiter in July 2016, Juno spent its main science mission learning Jupiter, together with its inside, aurorae, and big magnetosphere. Juno’s prolonged mission started in August 2021, which is slated to final till September 2025 and has been used to conduct flybys of Jupiter’s Galilean moons, Io, Europa, Ganymede, and Callisto. For Io, Juno has already carried out flybys in 2022 and earlier this yr, with the additional shut flybys for this new marketing campaign being scheduled for December 30, 2023, February 1, 2024, and September 20, 2024.

Infrared picture from the Juno spacecraft of Jupiter’s moon, Io, taken on July 5, 2022, that includes hotspots which might be volcanic options. (Credit score: NASA/JPL-Caltech/Southwest Analysis Institute/ASI/INAF/JIRAM)

“The possibility for a holistic strategy to Io investigations has not been obtainable since a sequence of Galileo spacecraft flybys in 1999-2000 have been supported by Hubble with a prolific 30-orbit marketing campaign,” stated Dr. Retherford. “The mixture of Juno’s intensive in situ measurements with our remote-sensing observations will undoubtedly advance our understanding of Io’s position in driving coupled phenomena within the Jupiter system.”

As famous, Io is the most volcanically active body in your entire photo voltaic system, boasting a whole lot of volcanoes that discharge lava dozens of kilometers (or miles) into house. Its volcanic exercise is the results of tidal heating because the small moon is compressed and stretched by the rather more large Jupiter, together with two of the outer moons, Europa and Ganymede. Io’s volcanic exercise was first predicted simply previous to the arrival of NASA’s Voyager 1 in 1979, which confirmed this exercise and imaged the first signs of active volcanism outside the Earth.

What new discoveries will JWST, Hubble, and Juno reveal in regards to the photo voltaic system’s most volcanically energetic planetary physique? Solely time will inform, and that is why we science!

As at all times, preserve doing science & preserve trying up!

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