Jupiter: Turmoil from below, battering from above

Oct 17, 2012
Images in the visible-light and infrared parts of the spectrum highlight the massive changes roiling the atmosphere of Jupiter. Image credit: NASA/IRTF/JPL-Caltech/NAOJ/A. Wesley/A. Kazemoto/C. Go

(Phys.org)—Jupiter, the mythical god of sky and thunder, would certainly be pleased at all the changes afoot at his namesake planet. As the planet gets peppered continually with small space rocks, wide belts of the atmosphere are changing color, hotspots are vanishing and reappearing, and clouds are gathering over one part of Jupiter, while dissipating over another. The results were presented today by Glenn Orton, a senior research scientist at NASA's Jet Propulsion Laboratory, Pasadena, Calif., at the American Astronomical Society's Division for Planetary Sciences Meeting in Reno, Nev.

"The changes we're seeing in are global in scale," Orton said. "We've seen some of these before, but never with modern instrumentation to clue us in on what's going on. Other changes haven't been seen in decades, and some regions have never been in the state they're appearing in now. At the same time, we've never seen so many things striking Jupiter. Right now, we're trying to figure out why this is all happening."

Orton and colleagues Leigh Fletcher of the University of Oxford, England; Padma Yanamandra-Fisher of the , Boulder, Colo.; Thomas Greathouse of Southwest Research Institute, San Antonio; and Takuyo Fujiyoshi of the , of Japan, Hilo, Hawaii, have been taking images and maps of Jupiter at from 2009 to 2012 and comparing them with high-quality visible images from the increasingly active amateur astronomy community. Following the fading and return of a prominent brown-colored belt just south of the equator, called the South , from 2009 to 2011, the team studied a similar fading and darkening that occurred at a band just north of the equator, known as the North Equatorial Belt. This belt grew whiter in 2011 to an extent not seen in more than a century. In March of this year, that northern band started to darken again.

Jupiter has been suffering more impacts over the last four years than ever previously observed, including this meteoroid impact on Sept. 10, 2012. Image credit: NASA/IRTF/JPL-Caltech/G. Hall/University of the Basque Country

The team obtained new data from NASA's Infrared Telescope Facility and the Subaru Telescope on Mauna Kea that matched up that activity with infrared observations. Those data showed a simultaneous thickening of the deeper cloud decks, but not necessarily the upper cloud deck, unlike the South Equatorial Belt, where both levels of clouds thickened and then cleared up. The infrared data also resolved brown, elongated features in the whitened area called "brown barges" as distinct features and revealed them to be regions clearer of clouds and probably characterized by downwelling, dry air.

The team was also looking out for a series of blue-gray features along the southern edge of the North Equatorial Belt. Those features appear to be the clearest and driest regions on the planet and show up as apparent hotspots in the infrared view, because they reveal the radiation emerging from a very deep layer of Jupiter's atmosphere. (NASA's Galileo spacecraft sent a probe into one of these hotspots in 1995.) Those hotspots disappeared from 2010 to 2011, but had reestablished themselves by June of this year, coincident with the whitening and re-darkening of the North Equatorial Belt.

While Jupiter's own atmosphere has been churning through change, a number of objects have hurtled into Jupiter's atmosphere, creating fireballs visible to amateur Jupiter watchers on Earth. Three of these objects - probably less than 45 feet (15 meters) in diameter - have been observed since 2010. The latest of these hit Jupiter on Sept. 10, 2012, although Orton and colleagues' infrared investigations of these events showed this one did not cause lasting changes in the atmosphere, unlike those in 1994 or 2009.

"It does appear that Jupiter is taking an unusual beating over the last few years, but we expect that this apparent increase has more to do with an increasing cadre of skilled amateur astronomers training their telescopes on Jupiter and helping scientists keep a closer eye on our biggest planet," Orton said. "It is precisely this coordination between the amateur-astronomy community that we want to foster."

The California Institute of Technology, Pasadena, operates the Jet Propulsion Laboratory for NASA.

Explore further: NASA seeks proposals for commercial Mars data relay satellites

Related Stories

Jupiter gets its stripe back

Nov 25, 2010

(PhysOrg.com) -- Astronomers using three telescopes atop Mauna Kea in Hawaii have recorded the return of a unique belt on Jupiter that periodically fades from dark brown to white. It's most recent fade-out ...

Jupiter has lost one of its cloud stripes

May 14, 2010

(PhysOrg.com) -- New photographs of the gas giant Jupiter, the first taken on May 9, show the massive reddish band of clouds known as the Southern Equatorial Belt in the planet’s southern hemisphere has ...

New Images Indicate Object Hits Jupiter

Jul 21, 2009

(PhysOrg.com) -- Scientists have found evidence that another object has bombarded Jupiter, exactly 15 years after the first impacts by the comet Shoemaker-Levy 9.

Image of Jupiter from a ground-based telescope

Mar 06, 2012

(PhysOrg.com) -- This image of Jupiter and its moons Io and Ganymede was acquired by amateur astronomer Damian Peach on Sept. 12, 2010, when Jupiter was close to opposition. South is up and the "Great Red ...

Recommended for you

Bacteria manipulate salt to build shelters to hibernate

12 hours ago

For the first time, Spanish researchers have detected an unknown interaction between microorganisms and salt. When Escherichia coli cells are introduced into a droplet of salt water and is left to dry, b ...

How do we terraform Venus?

12 hours ago

It might be possible to terraform Venus some day, when our technology gets good enough. The challenges for Venus are totally different than for Mars. How will we need to fix Venus?

Biomarkers of the deep

14 hours ago

Tucked away in the southwest corner of Spain is a unique geological site that has fascinated astrobiologists for decades. The Iberian Pyrite Belt (IPB) in Spain's Río Tinto area is the largest known deposit ...

User comments : 3

Adjust slider to filter visible comments by rank

Display comments: newest first

1 / 5 (11) Oct 17, 2012
"The changes we're seeing in Jupiter are global in scale,"
Ooh! Global climate change! It clearly must be anthropogenic!

1.8 / 5 (5) Oct 18, 2012
the real story here is that the more you look , the more you see. and the affect is that when you get new information you believe it is new not because you find more when you look more, but because you think that something you weren't knowledgeable about before was because the thing didn't exist before you first saw it.

I don't know if there is a psychological nickname for this effect but is a kind of psychological bias towards discovery. let's call it the discoverer's effect.
5 / 5 (2) Oct 18, 2012
the affect is that when you get new information you believe it is new not because you find more when you look more, but because you think that something you weren't knowledgeable about before was because the thing didn't exist before you first saw it.

I'm not really sure what you're trying to say. Maybe I missed it but I don't think anyone in the article believes it didn't happen before. The article states that the information is new - and it is, in that this information has been gathered recently, rather than in the past.

Jupiter is a great enigma, the more we know about it can only be better.