Looks like you're using an older browser. For the best experience possible, please upgrade your browser or download a modern browser.
We recommend these free browsers: Firefox or Chrome
You must update your Flash version to view videos. http://www.adobe.com/go/getflashplayer
For the optimal Juno experience please install Chrome. Download Chrome. Or continue to explore features of the Juno spacecraft using the links on your left.

News

06.06.18

Mens Nike Air No Force 270 (AH6772-200) Mens Size 11.5 No Air Box Lid 4fef20

Ever since NASA’s Voyager 1 spacecraft flew past Jupiter in March, 1979, scientists have wondered about the origin of Jupiter’s lightning. That encounter confirmed the existence of Jovian lightning, which had been theorized for centuries. But when the venerable explorer hurtled by, the data showed that the lightning-associated radio signals didn’t match the details of the radio signals produced by lightning here at Earth.

In a new paper published in Nature today, scientists from NASA’s Juno mission describe the ways in which lightning on Jupiter is actually analogous to Earth’s lightning. Although, in some ways, the two types of lightning are polar opposites.

“No matter what planet you’re on, lightning bolts act like radio transmitters -- sending out radio waves when they flash across a sky,” said Shannon Brown of NASA’s Jet Propulsion Laboratory in Pasadena, California, a Juno scientist and lead author of the paper. “But until Juno, all the lightning signals recorded by spacecraft [Voyagers 1 and 2, Galileo, Cassini] were limited to either visual detections or from the kilohertz range of the radio spectrum, despite a search for signals in the megahertz range. Many theories were offered up to explain it, but no one theory could ever get traction as the answer.”

Enter Juno, which has been orbiting Jupiter since July 4, 2016. Among its suite of highly sensitive instruments is the Microwave Radiometer Instrument (MWR), which records emissions from the gas giant across a wide spectrum of frequencies.  

“In the data from our first eight flybys, Juno’s MWR detected 377 lightning discharges,” said Brown. “They were recorded in the megahertz as well as gigahertz range, which is what you can find with terrestrial lightning emissions. We think the reason we are the only ones who can see it is because Juno is flying closer to the lighting than ever before, and we are searching at a radio frequency that passes easily through Jupiter’s ionosphere.”

While the revelation showed how Jupiter lightning is similar to Earth’s, the new paper also notes that where these lightning bolts flash on each planet is actually quite different.

“Jupiter lightning distribution is inside out relative to Earth,” said Brown. “There is a lot of activity near Jupiter’s poles but none near the equator. You can ask anybody who lives in the tropics -- this doesn’t hold true for our planet.”

Why do lightning bolts congregate near the equator on Earth and near the poles on Jupiter? Follow the heat.

Earth’s derives the vast majority of its heat externally from solar radiation, courtesy of our Sun. Because our equator bears the brunt of this sunshine, warm moist air rises (through convection) more freely there, which fuels towering thunderstorms that produce lightning.

Jupiter’s orbit is five times farther from the Sun than Earth’s orbit, which means that the giant planet receives 25 times less sunlight than Earth. But even though Jupiter’s atmosphere derives the majority of its heat from within the planet itself, this doesn’t render the Sun’s rays irrelevant. They do provide some warmth, heating up Jupiter’s equator more than the poles -- just as they heat up Earth. Scientists believe that this heating at Jupiter’s equator is just enough to create stability in the upper atmosphere, inhibiting the rise of warm air from within. The poles, which do not have this upper-level warmth and therefore no atmospheric stability, allow warm gases from Jupiter’s interior to rise, driving convection and therefore creating the ingredients for lightning.

“These findings could help to improve our understanding of the composition, circulation and energy flows on Jupiter,” said Brown. But another question looms, she said. “Even though we see lightning near both poles, why is it mostly recorded at Jupiter’s north pole?”

In a second Juno lightning paper published today in Nature Astronomy, Ivana Kolmašová of the Czech Academy of Sciences, Prague, and colleagues, present the largest database of lightning-generated low-frequency radio emissions around Jupiter (whistlers) to date. The data set of more than 1,600 signals, collected by Juno’s Waves instrument, is almost 10 times the number recorded by Voyager 1. Juno detected peak rates of four lightning strikes per second (similar to the rates observed in thunderstorms on Earth) which is six times higher than the peak values detected by Voyager 1.

“These discoveries could only happen with Juno,” said Scott Bolton, principal investigator of Juno from the Southwest Research Institute, San Antonio. “Our unique orbit allows our spacecraft to fly closer to Jupiter than any other spacecraft in history, so the signal strength of what the planet is radiating out is a thousand times stronger. Also, our microwave and plasma wave instruments are state-of-the-art, allowing us to pick out even weak lightning signals from the cacophony of radio emissions from Jupiter. “

NASA's Juno spacecraft will make its 13th science flyby over Jupiter's mysterious cloud tops on July 16.

NASA's Jet Propulsion Laboratory, Pasadena, California, manages the Juno mission for the principal investigator, Scott Bolton, of the Southwest Research Institute in San Antonio. Juno is part of NASA's New Frontiers Program, which is managed at NASA's Marshall Space Flight Center in Huntsville, Alabama, for NASA's Science Mission Directorate. The Microwave Radiometer instrument (MWR) was built by JPL. The Juno Waves instrument was provided by the University of Iowa. Lockheed Martin Space, Denver, built the spacecraft.
Nike SB AF2 Low Supreme Brown Size 11.5,Nike Kobe X Hot Lava / Sunset Glow Easter Shoes 705317-808 Mens 9,NIKE AIR FORCE 1 ONE '07 PREMIUM PRM 905345-201 VACHETTA TAN DS SIZE: 9.5,Nike Air Force 1 Low ‘07 AS QS All Star 90/10 2018 Vast Grey White Men's Size 13,Nike Air Max 2015 Reflective Silver & Black Running Shoes Sz 7 NEW 709013 001,Nike Air Presto Mid Utility Black Green Grove Size 10 859524-300,Nike Lebron 10 X Cutting Jade size 10.5 VVVNDS Worn 1x Excellent xmasNike Koth Ultra Mid Kjcrd Mens Style : 819681Nike Waffle Racer 17 TXT Black Gum Size 10. 876255-002 air max presto 2017Nike Dunk Lux SP White 10 Air Force 1 High QS City White Sf Af1 SbQuai54 Nike Lebron Soldier IX LMTD Q54 810803 015 Size 11,NEW Men's Nike Air Max 90 Big Logo NS GPX Shoes Sneakers Size: 8,Nike Air Force 1 Retro PRM Sail/Sail 941912-100 Men's Size 12.5,Nike Air Max 90 Essential Mens 537384-422 Armory Navy Running Shoes Size 8Men's Nike Zoom Tallac Flyknit ACG Boots Triple Black NikeLab SZ 7.5 865947-001Nike Air Force 1.  World Cup.  South Korea.Nike Men's Air Max 95 Prm Running Shoe ... 538416-404 Size 14NIKE AIR MAX2 CB '94 MENS BASKETBALL SHOES WHT/BLK/OLD RYL 305440-102,Nike Air Vapormax 97 GS AQ2657 700 Brand New Sz 6.5,1806 Nike Air Jordan 1 Low Men's Sneakers Sports Shoes 553558-401Mens Nike Air Max Vision PRM 918229-600 Port Wine Brand New Size 13Nike Air Huarache Drift Premium Mens AH7335-001 Black Running Shoes Size 10,Nike Air Max 90 Premium SE Mens 858954-400 Royal Cream Running Shoes Size 10,Nike Air Force 1 Ultra Flyknit Mid Mens 817420-401 Navy White Shoes Size 11.5,2014 Nike Air Jordan III 3 Powder Blue True Blue 136064 406 SZ: 4Y-15 NEW,Nike Mens Air Jordan XXX1 31 Low Georgetown Hoyas College 897564-007 Sz 11.5,Nike SB Golf Pack Dunk Low Premium Size Sz 7.5,2018 Nike Air Jordan 11 XI Retro Low OG SZ 11 Cool Grey White Smoke 528895-003Nike Air Jordan 11 XI Retro Low Cool Grey Medium Grey/White-Gunsmoke 528895-003,Mens Nike Dunk Flyknit 917746-600 University Red Brand New Size 10,
Men's Brand New Nike Air Max 270 "Just Do It" Fashion Sneakers,

Members of the media, please contact:

D.C. Agle
Juno Media Relations Representative
NASA's Jet Propulsion Laboratory
Dwayne Brown
NASA Public Affairs Officer
NASA Headquarters

Where is Juno now?

Visualize Juno’s journey through space and get up-to-date data sets using NASA's Eyes on the Solar System 3D interactive.